Fix/prevent crashes when MainWindow is closed before LoadFile() completes, or when it gets certain messages before TheThread completes initialization.
Fix missing ppsspp.ini loading log (only 1 unimportant line though).
Fix loading ui_atlas.zim failure when [General]Browse = True is set in ppsspp.ini.
Some other minor fixes as well.
Show the mouse cursor on full screen when it is moved or clicked.