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/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();