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.

app/task/project/load/load.cpp

@@ -33,51 +33,51 @@ ProjectLoadTask::ProjectLoadTask(const QString &filename)
 {
 }
 
-bool ProjectLoadTask::Run()
+bool ProjectLoadTask::run()
 {
 	project_ = new Project();
 
-	project_->set_filename(GetFilename());
+	project_->set_filename(get_filename());
 
-	ProjectSerializer::Result result = ProjectSerializer::Load(
-		project_, GetFilename(), ProjectSerializer::kProject);
+	ProjectSerializer::Result result = ProjectSerializer::load(
+		project_, get_filename(), ProjectSerializer::k_project);
 
-	layout_ = result.GetLoadData().layout;
+	layout_ = result.get_load_data().layout;
 
 	switch (result.code()) {
-	case ProjectSerializer::kSuccess:
+	case ProjectSerializer::k_success:
 		break;
-	case ProjectSerializer::kProjectTooOld:
-		SetError(tr(
+	case ProjectSerializer::k_project_too_old:
+		set_error(tr(
 			"This project is from a version of Oak Video Editor that is no longer supported in this version."));
 		break;
-	case ProjectSerializer::kProjectTooNew:
-		SetError(tr(
+	case ProjectSerializer::k_project_too_new:
+		set_error(tr(
 			"This project is from a newer version of Oak Video Editor and cannot be opened in this version."));
 		break;
-	case ProjectSerializer::kUnknownVersion:
-		SetError(tr("Failed to determine project version."));
+	case ProjectSerializer::k_unknown_version:
+		set_error(tr("Failed to determine project version."));
 		break;
-	case ProjectSerializer::kFileError:
-		SetError(
-			tr("Failed to read file \"%1\" for reading.").arg(GetFilename()));
+	case ProjectSerializer::k_file_error:
+		set_error(
+			tr("Failed to read file \"%1\" for reading.").arg(get_filename()));
 		break;
-	case ProjectSerializer::kXmlError:
-		SetError(
+	case ProjectSerializer::k_xml_error:
+		set_error(
 			tr("Failed to read XML document. File may be corrupt. Error was: %1")
-				.arg(result.GetDetails()));
+				.arg(result.get_details()));
 		break;
-	case ProjectSerializer::kNoData:
-		SetError(tr("Failed to find any data to parse."));
+	case ProjectSerializer::k_no_data:
+		set_error(tr("Failed to find any data to parse."));
 		break;
 
 		// Errors that should never be thrown by a load
-	case ProjectSerializer::kOverwriteError:
-		SetError(tr("Unknown error."));
+	case ProjectSerializer::k_overwrite_error:
+		set_error(tr("Unknown error."));
 		break;
 	}
 
-	if (result == ProjectSerializer::kSuccess) {
+	if (result == ProjectSerializer::k_success) {
 		project_->moveToThread(qApp->thread());
 		return true;
 	} else {

app/task/project/load/load.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef PROJECTLOADMANAGER_H
-#define PROJECTLOADMANAGER_H
+#ifndef OAK_PROJECTLOADMANAGER_H
+#define OAK_PROJECTLOADMANAGER_H
 
 #include "loadbasetask.h"
 #include "window/mainwindow/mainwindowlayoutinfo.h"
@@ -34,9 +34,9 @@ public:
 	ProjectLoadTask(const QString &filename);
 
 protected:
-	virtual bool Run() override;
+	virtual bool run() override;
 };
 
 }
 
-#endif // PROJECTLOADMANAGER_H
+#endif // OAK_PROJECTLOADMANAGER_H

app/task/project/load/loadbasetask.cpp

@@ -28,7 +28,7 @@ ProjectLoadBaseTask::ProjectLoadBaseTask(const QString &filename)
 	: project_(nullptr)
 	, filename_(filename)
 {
-	SetTitle(tr("Loading '%1'").arg(filename));
+	set_title(tr("Loading '%1'").arg(filename));
 }
 
 }

app/task/project/load/loadbasetask.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef PROJECTLOADBASETASK_H
-#define PROJECTLOADBASETASK_H
+#ifndef OAK_PROJECTLOADBASETASK_H
+#define OAK_PROJECTLOADBASETASK_H
 
 #include "node/project.h"
 #include "task/task.h"
@@ -33,17 +33,17 @@ class ProjectLoadBaseTask : public Task {
 public:
 	ProjectLoadBaseTask(const QString &filename);
 
-	Project *GetLoadedProject() const
+	Project *get_loaded_project() const
 	{
 		return project_;
 	}
 
-	const QString &GetFilename() const
+	const QString &get_filename() const
 	{
 		return filename_;
 	}
 
-	const MainWindowLayoutInfo &GetLoadedLayout() const
+	const MainWindowLayoutInfo &get_loaded_layout() const
 	{
 		return layout_;
 	}