style: unify identifier naming per updated conventions

Automated with clang-tidy readability-identifier-naming (config added to
.clang-tidy) plus scripted passes, per the updated rules now documented
in CONTRIBUTING.md:

- types (class/struct/enum/alias/template params): PascalCase
- functions, variables, members: snake_case (incl. rational -> Rational)
- private/protected members: trailing underscore; static member
  variables likewise (instance_, available_themes_)
- constants and enum values: snake_case (kLinear -> k_linear,
  F32P -> f32p); ALL_CAPS reserved for macros
- macros: OAK_ prefix (OLIVE_ADD_TEST/OLIVE_ASSERT/OLIVE_CONFIG ->
  OAK_ADD_TEST/OAK_ASSERT/OAK_CONFIG, GL_PREAMBLE -> OAK_GL_PREAMBLE,
  include guards -> OAK_*)
- file names: all lowercase (Current/Plugin/OliveHost/OliveClip/
  OlivePluginInstance -> current/plugin/olivehost/oliveclip/
  oliveplugininstance)
- getters share the member name sans underscore, setters set_foo()
- Qt and third-party (OpenFX) virtual overrides and framework callbacks
  keep their original names (exempt in .clang-tidy)

Manual follow-ups required where automation could not reach:
- string-based QMetaObject/SIGNAL/SLOT references updated to renamed
  methods (AddTask, CreatedFile, DeleteSpecificFile, moveSelectionUp, ...)
- macro bodies referencing renamed methods (OLIVE_CONFIG,
  NODE_DEFAULT_DESTRUCTOR, MANAGEDDISPLAYWIDGET_*)
- self-shadowing locals renamed where signals/methods became same-named
  (size_changed, worker_count, selected_items, import param, filters)
- third_party OFX member/namespace usages restored (OFX::Host::*,
  _created, _clipPrefsDirty, createInstance, clearPersistentMessage)
- STL protocol aliases restored (const_iterator) with .clang-tidy
  ignore rules; qHash overloads restored

Full build and test suite pass: ctest 4/4, ~1960 gtest cases green.

tests/gtest/preferences_behavior_tab_test.cpp

@@ -12,32 +12,32 @@ using namespace olive;
 
 TEST(PreferencesBehaviorTab, TimelineCategoryHasExpectedCheckboxes)
 {
-	PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryTimeline);
+	PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_timeline);
 	// 8 timeline behavior options
 	EXPECT_EQ(tab.findChildren<QCheckBox *>().size(), 8);
 }
 
 TEST(PreferencesBehaviorTab, PlaybackCategoryHasExpectedCheckboxes)
 {
-	PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryPlayback);
+	PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_playback);
 	EXPECT_EQ(tab.findChildren<QCheckBox *>().size(), 2);
 }
 
 TEST(PreferencesBehaviorTab, ProjectCategoryHasExpectedCheckboxes)
 {
-	PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryProject);
+	PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_project);
 	EXPECT_EQ(tab.findChildren<QCheckBox *>().size(), 1);
 }
 
 TEST(PreferencesBehaviorTab, NodesCategoryHasExpectedCheckboxes)
 {
-	PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryNodes);
+	PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_nodes);
 	EXPECT_EQ(tab.findChildren<QCheckBox *>().size(), 3);
 }
 
 TEST(PreferencesBehaviorTab, RenderingCategoryHasGraphicsBackendCombobox)
 {
-	PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryRendering);
+	PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_rendering);
 	EXPECT_FALSE(tab.findChildren<QComboBox *>().isEmpty());
 	EXPECT_FALSE(tab.findChildren<QCheckBox *>().isEmpty());
 }
@@ -49,16 +49,16 @@ TEST(PreferencesBehaviorTab, BehaviorPrefTrReturnsExactSourceStrings)
 	// text unchanged. Pin the exact strings so accidental edits are caught
 	// (they would silently change the translation keys and the cross-tab
 	// lookups that rely on them).
-	EXPECT_EQ(PreferencesBehaviorTab::BehaviorPrefTr("Behavior"),
+	EXPECT_EQ(PreferencesBehaviorTab::behavior_pref_tr("Behavior"),
 			  QStringLiteral("Behavior"));
-	EXPECT_EQ(PreferencesBehaviorTab::BehaviorPrefTr("Enable hover focus"),
+	EXPECT_EQ(PreferencesBehaviorTab::behavior_pref_tr("Enable hover focus"),
 			  QStringLiteral("Enable hover focus"));
-	EXPECT_EQ(PreferencesBehaviorTab::BehaviorPrefTr("Enable slider ladder"),
+	EXPECT_EQ(PreferencesBehaviorTab::behavior_pref_tr("Enable slider ladder"),
 			  QStringLiteral("Enable slider ladder"));
-	EXPECT_EQ(PreferencesBehaviorTab::BehaviorPrefTr(
+	EXPECT_EQ(PreferencesBehaviorTab::behavior_pref_tr(
 				  "Scrolling zooms by default"),
 			  QStringLiteral("Scrolling zooms by default"));
-	EXPECT_EQ(PreferencesBehaviorTab::BehaviorPrefTr("Enable audio scrubbing"),
+	EXPECT_EQ(PreferencesBehaviorTab::behavior_pref_tr("Enable audio scrubbing"),
 			  QStringLiteral("Enable audio scrubbing"));
 }
 
@@ -67,12 +67,12 @@ TEST(PreferencesBehaviorTab, RenderingCategoryContainsDefaultBackend)
 	// Force the config back to the registered default so the selected entry
 	// is deterministic regardless of test order
 	const QVariant saved_backend =
-		Config::Current()[QStringLiteral("GraphicsBackend")];
-	Config::Current()[QStringLiteral("GraphicsBackend")] =
+		Config::current()[QStringLiteral("GraphicsBackend")];
+	Config::current()[QStringLiteral("GraphicsBackend")] =
 		QStringLiteral("opengl");
 
 	{
-		PreferencesBehaviorTab tab(PreferencesBehaviorTab::kCategoryRendering);
+		PreferencesBehaviorTab tab(PreferencesBehaviorTab::k_category_rendering);
 		QList<QComboBox *> boxes = tab.findChildren<QComboBox *>();
 		ASSERT_FALSE(boxes.isEmpty());
 
@@ -87,7 +87,7 @@ TEST(PreferencesBehaviorTab, RenderingCategoryContainsDefaultBackend)
 		EXPECT_EQ(backend_box->currentIndex(), opengl_index);
 	}
 
-	Config::Current()[QStringLiteral("GraphicsBackend")] = saved_backend;
+	Config::current()[QStringLiteral("GraphicsBackend")] = saved_backend;
 }
 
 TEST(PreferencesGeneralTab, ContainsHoverFocusOption)
@@ -98,7 +98,7 @@ TEST(PreferencesGeneralTab, ContainsHoverFocusOption)
 	bool found = false;
 	foreach (QCheckBox *box, boxes) {
 		if (box->text() ==
-			PreferencesBehaviorTab::BehaviorPrefTr("Enable hover focus")) {
+			PreferencesBehaviorTab::behavior_pref_tr("Enable hover focus")) {
 			found = true;
 			break;
 		}
@@ -108,7 +108,7 @@ TEST(PreferencesGeneralTab, ContainsHoverFocusOption)
 
 TEST(PreferencesAudioTab, AudioScrubbingCheckboxUsesBehaviorTranslation)
 {
-	AudioManager::CreateInstance();
+	AudioManager::create_instance();
 
 	{
 		PreferencesAudioTab tab;
@@ -116,7 +116,7 @@ TEST(PreferencesAudioTab, AudioScrubbingCheckboxUsesBehaviorTranslation)
 
 		bool found = false;
 		foreach (QCheckBox *box, boxes) {
-			if (box->text() == PreferencesBehaviorTab::BehaviorPrefTr(
+			if (box->text() == PreferencesBehaviorTab::behavior_pref_tr(
 								   "Enable audio scrubbing")) {
 				found = true;
 				break;
@@ -125,7 +125,7 @@ TEST(PreferencesAudioTab, AudioScrubbingCheckboxUsesBehaviorTranslation)
 		EXPECT_TRUE(found);
 	}
 
-	AudioManager::DestroyInstance();
+	AudioManager::destroy_instance();
 }
 
 TEST(PreferencesGeneralTab, IncludesBehaviorOptions)
@@ -137,7 +137,7 @@ TEST(PreferencesGeneralTab, IncludesBehaviorOptions)
 
 TEST(PreferencesAudioTab, IncludesAudioScrubbingOption)
 {
-	AudioManager::CreateInstance();
+	AudioManager::create_instance();
 
 	{
 		PreferencesAudioTab tab;
@@ -154,8 +154,8 @@ TEST(PreferencesAudioTab, IncludesAudioScrubbingOption)
 
 		// Its initial state mirrors the AudioScrubbing config entry
 		EXPECT_EQ(scrubbing->isChecked(),
-				  Config::Current()[QStringLiteral("AudioScrubbing")].toBool());
+				  Config::current()[QStringLiteral("AudioScrubbing")].toBool());
 	}
 
-	AudioManager::DestroyInstance();
+	AudioManager::destroy_instance();
 }