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/widget/colorlabelmenu/colorcodingcombobox.cpp

@@ -29,7 +29,7 @@ namespace olive
 ColorCodingComboBox::ColorCodingComboBox(QWidget *parent)
 	: QComboBox(parent)
 {
-	SetColor(0);
+	set_color(0);
 }
 
 void ColorCodingComboBox::showPopup()
@@ -41,14 +41,14 @@ void ColorCodingComboBox::showPopup()
 	QAction *a = menu.exec(parentWidget()->mapToGlobal(pos()));
 
 	if (a) {
-		SetColor(a->data().toInt());
+		set_color(a->data().toInt());
 	}
 }
 
-void ColorCodingComboBox::SetColor(int index)
+void ColorCodingComboBox::set_color(int index)
 {
 	clear();
-	addItem(ColorCoding::GetColorName(index));
+	addItem(ColorCoding::get_color_name(index));
 	index_ = index;
 }
 

app/widget/colorlabelmenu/colorcodingcombobox.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef COLORCODINGCOMBOBOX_H
-#define COLORCODINGCOMBOBOX_H
+#ifndef OAK_COLORCODINGCOMBOBOX_H
+#define OAK_COLORCODINGCOMBOBOX_H
 
 #include <QComboBox>
 
@@ -36,9 +36,9 @@ public:
 
 	virtual void showPopup() override;
 
-	void SetColor(int index);
+	void set_color(int index);
 
-	int GetSelectedColor() const
+	int get_selected_color() const
 	{
 		return index_;
 	}
@@ -49,4 +49,4 @@ private:
 
 }
 
-#endif // COLORCODINGCOMBOBOX_H
+#endif // OAK_COLORCODINGCOMBOBOX_H

app/widget/colorlabelmenu/colorlabelmenu.cpp

@@ -44,41 +44,41 @@ ColorLabelMenu::ColorLabelMenu(QWidget *parent)
 		QPainter painter(&p);
 		painter.setPen(Qt::black);
 		painter.setBrush(
-			QtUtils::toQColor(ColorCoding::standard_colors().at(i)));
+			QtUtils::to_q_color(ColorCoding::standard_colors().at(i)));
 		painter.drawRect(p.rect().adjusted(0, 0, -1, -1));
 
-		QAction *a = AddItem(QStringLiteral("colorlabel%1").arg(i), this,
-							 &ColorLabelMenu::ActionTriggered);
+		QAction *a = add_item(QStringLiteral("colorlabel%1").arg(i), this,
+							 &ColorLabelMenu::action_triggered);
 		a->setIcon(p);
 		a->setData(i);
 		color_items_.replace(i, a);
 	}
 
-	Retranslate();
+	retranslate();
 }
 
 void ColorLabelMenu::changeEvent(QEvent *event)
 {
 	if (event->type() == QEvent::LanguageChange) {
-		Retranslate();
+		retranslate();
 	}
 
 	Menu::changeEvent(event);
 }
 
-void ColorLabelMenu::Retranslate()
+void ColorLabelMenu::retranslate()
 {
 	this->setTitle(tr("Color"));
 
 	for (int i = 0; i < color_items_.size(); i++) {
-		color_items_.at(i)->setText(ColorCoding::GetColorName(i));
+		color_items_.at(i)->setText(ColorCoding::get_color_name(i));
 	}
 }
 
-void ColorLabelMenu::ActionTriggered()
+void ColorLabelMenu::action_triggered()
 {
 	QAction *a = static_cast<QAction *>(sender());
-	emit ColorSelected(a->data().toInt());
+	emit color_selected(a->data().toInt());
 }
 
 }

app/widget/colorlabelmenu/colorlabelmenu.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef COLORLABELMENU_H
-#define COLORLABELMENU_H
+#ifndef OAK_COLORLABELMENU_H
+#define OAK_COLORLABELMENU_H
 
 #include "widget/menu/menu.h"
 
@@ -35,17 +35,17 @@ public:
 	virtual void changeEvent(QEvent *event) override;
 
 signals:
-	void ColorSelected(int i);
+	void color_selected(int i);
 
 private:
-	void Retranslate();
+	void retranslate();
 
 	QVector<QAction *> color_items_;
 
 private slots:
-	void ActionTriggered();
+	void action_triggered();
 };
 
 }
 
-#endif // COLORLABELMENU_H
+#endif // OAK_COLORLABELMENU_H