build: rebrand output artifacts to Oak and fix macOS QML deployment

- Rename macOS bundle output from Olive.app to Oak.app.
- Rename editor binary to oak-editor and render worker to oak-render-worker.
- Rename crash handler output to oak-crashhandler.
- Update worker lookup, NSIS installer, Linux desktop/AppRun, crashhandler
  symbol paths, and documentation for the new binary names.
- Update CD workflow paths and add -qmldir flags to macdeployqt so QtQuick
  / QML plugins required by KDDockWidgets are bundled, fixing the launch
  crash on macOS.
- Update user-facing GitHub URLs to OakVideoEditorCommunity/oak.

app/render/rendermanager.h

@@ -82,7 +82,7 @@ public:
 		/// Vulkan requested by the user. Falls back to OpenGL until VulkanRenderer is implemented.
 		kVulkan,
 
-		/// Video frames are rendered by an external olive-render-worker process.
+		/// Video frames are rendered by an external oak-render-worker process.
 		kMultiProcess,
 
 		/// No graphics rendering - used to test core threading logic

app/render/renderworkerpool.cpp

@@ -241,9 +241,9 @@ bool DecodeInputFrames(DecoderCache *decoder_cache,
 QString WorkerProgramPath()
 {
 #if defined(Q_OS_WIN)
-	const QString file = QStringLiteral("olive-render-worker.exe");
+	const QString file = QStringLiteral("oak-render-worker.exe");
 #else
-	const QString file = QStringLiteral("olive-render-worker");
+	const QString file = QStringLiteral("oak-render-worker");
 #endif
 
 	const QString app_dir = QCoreApplication::applicationDirPath();

app/render/worker/workermain.cpp

@@ -547,7 +547,7 @@ int main(int argc, char *argv[])
 #endif
 
 	QCoreApplication::setOrganizationName(QStringLiteral("oakvideoeditor.org"));
-	QCoreApplication::setApplicationName(QStringLiteral("olive-render-worker"));
+	QCoreApplication::setApplicationName(QStringLiteral("oak-render-worker"));
 
 	QString backend = QStringLiteral("opengl");
 	const QStringList args = app.arguments();