Instead of tying the QFileSystemWatcher to the GameList and updating in
the UI thread, this change moves it to the worker thread. Since it gets
deleted and recreated as part of the worker thread, this prevents it from
ever getting used from multiple threads (which is why it was originally
done on the UI thread)
* citra-qt: game list search function
* Empty search field during game list refresh
* Code improvements
* Code formatting
* Autofocus search field
* JayFoxRox's recommendations
* lioncash's review
* Added a refresh game directory option to the file menu
* Make the game list watcher recursive and have it start watching from the initial load
* Rework game list watcher to be thread safe
* Fix code style issues
