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/timelinewidget/tool/record.cpp

@@ -29,78 +29,78 @@ RecordTool::RecordTool(TimelineWidget *parent)
 {
 }
 
-void RecordTool::MousePress(TimelineViewMouseEvent *event)
+void RecordTool::mouse_press(TimelineViewMouseEvent *event)
 {
-	const Track::Reference &track = event->GetTrack();
+	const Track::Reference &track = event->get_track();
 
 	// Check if track is locked
-	Track *t = parent()->GetTrackFromReference(track);
-	if (t && t->IsLocked()) {
+	Track *t = parent()->get_track_from_reference(track);
+	if (t && t->is_locked()) {
 		return;
 	}
 
-	if (t && t->type() != Track::kAudio) {
+	if (t && t->type() != Track::k_audio) {
 		// We only support audio tracks here
 		return;
 	}
 
 	drag_start_point_ =
-		ValidatedCoordinate(event->GetCoordinates(true)).GetFrame();
+		validated_coordinate(event->get_coordinates(true)).get_frame();
 
 	ghost_ = new TimelineViewGhostItem();
-	ghost_->SetIn(drag_start_point_);
-	ghost_->SetOut(drag_start_point_);
-	ghost_->SetTrack(track);
-	parent()->AddGhost(ghost_);
+	ghost_->set_in(drag_start_point_);
+	ghost_->set_out(drag_start_point_);
+	ghost_->set_track(track);
+	parent()->add_ghost(ghost_);
 
 	snap_points_.push_back(drag_start_point_);
 }
 
-void RecordTool::MouseMove(TimelineViewMouseEvent *event)
+void RecordTool::mouse_move(TimelineViewMouseEvent *event)
 {
 	if (!ghost_) {
 		return;
 	}
 
 	// Calculate movement
-	rational movement = event->GetFrame() - drag_start_point_;
+	Rational movement = event->get_frame() - drag_start_point_;
 
 	// Validation: Ensure in point never goes below 0
-	if (movement < -ghost_->GetIn()) {
-		movement = -ghost_->GetIn();
+	if (movement < -ghost_->get_in()) {
+		movement = -ghost_->get_in();
 	}
 
 	// Snap movement
 	bool snapped;
 
 	if (Core::instance()->snapping()) {
-		snapped = parent()->SnapPoint(snap_points_, &movement);
+		snapped = parent()->snap_point(snap_points_, &movement);
 	} else {
 		snapped = false;
 	}
 
 	// Make adjustment
 	if (!movement) {
-		ghost_->SetInAdjustment(0);
-		ghost_->SetOutAdjustment(0);
+		ghost_->set_in_adjustment(0);
+		ghost_->set_out_adjustment(0);
 	} else if (movement > 0) {
-		ghost_->SetInAdjustment(0);
-		ghost_->SetOutAdjustment(movement);
+		ghost_->set_in_adjustment(0);
+		ghost_->set_out_adjustment(movement);
 	} else if (movement < 0) {
-		ghost_->SetInAdjustment(movement);
-		ghost_->SetOutAdjustment(0);
+		ghost_->set_in_adjustment(movement);
+		ghost_->set_out_adjustment(0);
 	}
 
 	Q_UNUSED(snapped)
 }
 
-void RecordTool::MouseRelease(TimelineViewMouseEvent *event)
+void RecordTool::mouse_release(TimelineViewMouseEvent *event)
 {
 	if (ghost_) {
-		emit parent() -> RequestCaptureStart(
-			TimeRange(ghost_->GetAdjustedIn(), ghost_->GetAdjustedOut()),
-			ghost_->GetTrack());
-		parent()->ClearGhosts();
+		emit parent() -> request_capture_start(
+			TimeRange(ghost_->get_adjusted_in(), ghost_->get_adjusted_out()),
+			ghost_->get_track());
+		parent()->clear_ghosts();
 		snap_points_.clear();
 		ghost_ = nullptr;
 	}