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/panel/scope/scope.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef SCOPE_PANEL_H
-#define SCOPE_PANEL_H
+#ifndef OAK_SCOPE_PANEL_H
+#define OAK_SCOPE_PANEL_H
 
 #include <QComboBox>
 #include <QStackedWidget>
@@ -38,33 +38,33 @@ class ScopePanel : public PanelWidget {
 	Q_OBJECT
 public:
 	enum Type {
-		kTypeWaveform,
-		kTypeVectorscope,
-		kTypeHistogram,
+		k_type_waveform,
+		k_type_vectorscope,
+		k_type_histogram,
 
-		kTypeCount
+		k_type_count
 	};
 
 	ScopePanel();
 
-	void SetType(Type t);
+	void set_type(Type t);
 
-	static QString TypeToName(Type t);
+	static QString type_to_name(Type t);
 
-	void SetViewerPanel(ViewerPanelBase *vp);
+	void set_viewer_panel(ViewerPanelBase *vp);
 
-	ViewerPanelBase *GetConnectedViewerPanel() const
+	ViewerPanelBase *get_connected_viewer_panel() const
 	{
 		return viewer_;
 	}
 
 public slots:
-	void SetReferenceBuffer(TexturePtr frame);
+	void set_reference_buffer(TexturePtr frame);
 
-	void SetColorManager(ColorManager *manager);
+	void set_color_manager(ColorManager *manager);
 
 protected:
-	virtual void Retranslate() override;
+	virtual void retranslate() override;
 
 private:
 	Type type_;
@@ -84,4 +84,4 @@ private:
 
 }
 
-#endif // SCOPE_PANEL_H
+#endif // OAK_SCOPE_PANEL_H