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/window/mainwindow/mainmenu.cpp

@@ -788,7 +788,7 @@ void MainMenu::SequenceCacheClearTriggered()
 void MainMenu::HelpFeedbackTriggered()
 {
 	QDesktopServices::openUrl(
-		QStringLiteral("https://github.com/olive-editor/olive/issues"));
+		QStringLiteral("https://github.com/OakVideoEditorCommunity/oak/issues"));
 }
 
 void MainMenu::Retranslate()