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/render/renderticket.h

@@ -19,8 +19,8 @@
 
 ***/
 
-#ifndef RENDERTICKET_H
-#define RENDERTICKET_H
+#ifndef OAK_RENDERTICKET_H
+#define OAK_RENDERTICKET_H
 
 #include <QDateTime>
 #include <QMutex>
@@ -44,7 +44,7 @@ public:
    * This function is thread safe, unless `lock` is set to false. Then the caller has responsibility
    * of locking the mutex before and unlocking after this function is called.
    */
-	bool IsRunning(bool lock = true);
+	bool is_running(bool lock = true);
 
 	/**
    * @brief Determine how many times ticket has been finished
@@ -52,27 +52,27 @@ public:
    * This function is thread safe, unless `lock` is set to false. Then the caller has responsibility
    * of locking the mutex before and unlocking after this function is called.
    */
-	int GetFinishCount(bool lock = true);
+	int get_finish_count(bool lock = true);
 
 	/**
    * @brief Check if this ticket has a result
    *
    * If this ticket is running, this will always return false.
    */
-	bool HasResult();
+	bool has_result();
 
 	/**
    * @brief Get value, if any
    */
-	QVariant Get();
+	QVariant get();
 
 	/**
    * @brief Wait for ticket to be finished
    *
    * If this ticket is not running, this function returns immediately.
    */
-	void WaitForFinished();
-	void WaitForFinished(QMutex *mutex);
+	void wait_for_finished();
+	void wait_for_finished(QMutex *mutex);
 
 	/**
    * @brief Access this ticket's mutex
@@ -90,30 +90,30 @@ public:
    *
    * If any value is set, it is cleared.
    */
-	void Start();
+	void start();
 
 	/**
    * @brief Finish ticket with no value
    *
    * Sets ticket to no longer running and assume it has received no result.
    */
-	void Finish();
+	void finish();
 
 	/**
    * @brief Finish ticket with value
    *
    * Sets ticket to no longer running and provide a value generated by the operation requested.
    */
-	void Finish(QVariant result);
+	void finish(QVariant result);
 
 signals:
 	/**
    * @brief Emitted when finish has been called by any means (either cancelled or with a result)
    */
-	void Finished();
+	void finished();
 
 private:
-	void FinishInternal(bool has_result, QVariant result);
+	void finish_internal(bool has_result, QVariant result);
 
 	bool is_running_;
 
@@ -135,35 +135,35 @@ class RenderTicketWatcher : public QObject {
 public:
 	RenderTicketWatcher(QObject *parent = nullptr);
 
-	RenderTicketPtr GetTicket() const
+	RenderTicketPtr get_ticket() const
 	{
 		return ticket_;
 	}
 
-	void SetTicket(RenderTicketPtr ticket);
+	void set_ticket(RenderTicketPtr ticket);
 
-	bool IsRunning();
+	bool is_running();
 
-	void WaitForFinished();
+	void wait_for_finished();
 
-	QVariant Get();
+	QVariant get();
 
-	bool HasResult();
+	bool has_result();
 
-	void Cancel();
+	void cancel();
 
 signals:
-	void Finished(RenderTicketWatcher *watcher);
+	void finished(RenderTicketWatcher *watcher);
 
 private:
 	RenderTicketPtr ticket_;
 
 private slots:
-	void TicketFinished();
+	void ticket_finished();
 };
 
 }
 
 Q_DECLARE_METATYPE(olive::RenderTicketPtr)
 
-#endif // RENDERTICKET_H
+#endif // OAK_RENDERTICKET_H