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/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();