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/handmovableview/handmovableview.cpp

@@ -37,13 +37,13 @@ HandMovableView::HandMovableView(QWidget *parent)
 	, default_drag_mode_(NoDrag)
 	, is_timeline_axes_(false)
 {
-	connect(Core::instance(), &Core::ToolChanged, this,
-			&HandMovableView::ApplicationToolChanged);
+	connect(Core::instance(), &Core::tool_changed, this,
+			&HandMovableView::application_tool_changed);
 }
 
-void HandMovableView::ApplicationToolChanged(Tool::Item tool)
+void HandMovableView::application_tool_changed(Tool::Item tool)
 {
-	if (tool == Tool::kHand) {
+	if (tool == Tool::k_hand) {
 		setDragMode(ScrollHandDrag);
 		setInteractive(false);
 	} else {
@@ -54,7 +54,7 @@ void HandMovableView::ApplicationToolChanged(Tool::Item tool)
 	ToolChangedEvent(tool);
 }
 
-bool HandMovableView::HandPress(QMouseEvent *event)
+bool HandMovableView::hand_press(QMouseEvent *event)
 {
 	if (event->button() == Qt::MiddleButton) {
 		pre_hand_drag_mode_ = dragMode();
@@ -77,7 +77,7 @@ bool HandMovableView::HandPress(QMouseEvent *event)
 	return false;
 }
 
-bool HandMovableView::HandMove(QMouseEvent *event)
+bool HandMovableView::hand_move(QMouseEvent *event)
 {
 	if (dragging_hand_) {
 		// Transform mouse event to act like the left button is pressed
@@ -112,7 +112,7 @@ bool HandMovableView::HandMove(QMouseEvent *event)
 	return dragging_hand_;
 }
 
-bool HandMovableView::HandRelease(QMouseEvent *event)
+bool HandMovableView::hand_release(QMouseEvent *event)
 {
 	if (dragging_hand_) {
 		// Transform mouse event to act like the left button is pressed
@@ -134,13 +134,13 @@ bool HandMovableView::HandRelease(QMouseEvent *event)
 	return false;
 }
 
-void HandMovableView::SetDefaultDragMode(HandMovableView::DragMode mode)
+void HandMovableView::set_default_drag_mode(HandMovableView::DragMode mode)
 {
 	default_drag_mode_ = mode;
 	setDragMode(default_drag_mode_);
 }
 
-const HandMovableView::DragMode &HandMovableView::GetDefaultDragMode() const
+const HandMovableView::DragMode &HandMovableView::get_default_drag_mode() const
 {
 	return default_drag_mode_;
 }
@@ -148,10 +148,10 @@ const HandMovableView::DragMode &HandMovableView::GetDefaultDragMode() const
 bool HandMovableView::WheelEventIsAZoomEvent(QWheelEvent *event)
 {
 	return (static_cast<bool>(event->modifiers() & Qt::ControlModifier) ==
-			!OLIVE_CONFIG("ScrollZooms").toBool());
+			!OAK_CONFIG("ScrollZooms").toBool());
 }
 
-qreal HandMovableView::GetScrollZoomMultiplier(QWheelEvent *event)
+qreal HandMovableView::get_scroll_zoom_multiplier(QWheelEvent *event)
 {
 	qreal v =
 		(static_cast<qreal>(event->angleDelta().x() + event->angleDelta().y()) *
@@ -166,7 +166,7 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 {
 	if (WheelEventIsAZoomEvent(event)) {
 		if (!event->angleDelta().isNull()) {
-			qreal multiplier = GetScrollZoomMultiplier(event);
+			qreal multiplier = get_scroll_zoom_multiplier(event);
 
 			QPointF cursor_pos;
 #if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
@@ -175,14 +175,14 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 			cursor_pos = event->posF();
 #endif
 
-			ZoomIntoCursorPosition(event, multiplier, cursor_pos);
+			zoom_into_cursor_position(event, multiplier, cursor_pos);
 		}
 	} else if (is_timeline_axes_) {
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
 
 		QPoint angle_delta = event->angleDelta();
 
-		if (OLIVE_CONFIG("InvertTimelineScrollAxes")
+		if (OAK_CONFIG("InvertTimelineScrollAxes")
 				.toBool() // Check if config is set to invert timeline axes
 			&&
 			event->source() !=
@@ -204,7 +204,7 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 
 		Qt::Orientation orientation = event->orientation();
 
-		if (OLIVE_CONFIG("InvertTimelineScrollAxes").toBool()) {
+		if (OAK_CONFIG("InvertTimelineScrollAxes").toBool()) {
 			orientation = (orientation == Qt::Horizontal) ? Qt::Vertical :
 															Qt::Horizontal;
 		}
@@ -220,7 +220,7 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 	}
 }
 
-void HandMovableView::ZoomIntoCursorPosition(QWheelEvent *event,
+void HandMovableView::zoom_into_cursor_position(QWheelEvent *event,
 											 double multiplier,
 											 const QPointF &cursor_pos)
 {