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/timetarget/timetarget.cpp

@@ -30,12 +30,12 @@ TimeTargetObject::TimeTargetObject()
 {
 }
 
-ViewerOutput *TimeTargetObject::GetTimeTarget() const
+ViewerOutput *TimeTargetObject::get_time_target() const
 {
 	return time_target_;
 }
 
-void TimeTargetObject::SetTimeTarget(ViewerOutput *target)
+void TimeTargetObject::set_time_target(ViewerOutput *target)
 {
 	if (time_target_) {
 		TimeTargetDisconnectEvent(time_target_);
@@ -49,31 +49,31 @@ void TimeTargetObject::SetTimeTarget(ViewerOutput *target)
 	}
 }
 
-void TimeTargetObject::SetPathIndex(int index)
+void TimeTargetObject::set_path_index(int index)
 {
 	path_index_ = index;
 }
 
-rational
-TimeTargetObject::GetAdjustedTime(Node *from, Node *to, const rational &r,
+Rational
+TimeTargetObject::get_adjusted_time(Node *from, Node *to, const Rational &r,
 								  Node::TransformTimeDirection dir) const
 {
 	if (!from || !to) {
 		return r;
 	}
 
-	return GetAdjustedTime(from, to, TimeRange(r, r), dir).in();
+	return get_adjusted_time(from, to, TimeRange(r, r), dir).in();
 }
 
 TimeRange
-TimeTargetObject::GetAdjustedTime(Node *from, Node *to, const TimeRange &r,
+TimeTargetObject::get_adjusted_time(Node *from, Node *to, const TimeRange &r,
 								  Node::TransformTimeDirection dir) const
 {
 	if (!from || !to) {
 		return r;
 	}
 
-	return from->TransformTimeTo(r, to, dir, path_index_);
+	return from->transform_time_to(r, to, dir, path_index_);
 }
 
 /*int TimeTargetObject::GetNumberOfPathAdjustments(Node* from, NodeParam::Type direction) const

app/widget/timetarget/timetarget.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef TIMETARGETOBJECT_H
-#define TIMETARGETOBJECT_H
+#ifndef OAK_TIMETARGETOBJECT_H
+#define OAK_TIMETARGETOBJECT_H
 
 #include "node/output/viewer/viewer.h"
 
@@ -31,14 +31,14 @@ class TimeTargetObject {
 public:
 	TimeTargetObject();
 
-	ViewerOutput *GetTimeTarget() const;
-	void SetTimeTarget(ViewerOutput *target);
+	ViewerOutput *get_time_target() const;
+	void set_time_target(ViewerOutput *target);
 
-	void SetPathIndex(int index);
+	void set_path_index(int index);
 
-	rational GetAdjustedTime(Node *from, Node *to, const rational &r,
+	Rational get_adjusted_time(Node *from, Node *to, const Rational &r,
 							 Node::TransformTimeDirection dir) const;
-	TimeRange GetAdjustedTime(Node *from, Node *to, const TimeRange &r,
+	TimeRange get_adjusted_time(Node *from, Node *to, const TimeRange &r,
 							  Node::TransformTimeDirection dir) const;
 
 	//int GetNumberOfPathAdjustments(Node* from, NodeParam::Type direction) const;
@@ -62,4 +62,4 @@ private:
 
 }
 
-#endif // TIMETARGETOBJECT_H
+#endif // OAK_TIMETARGETOBJECT_H