Fixed a bug where qt volume slider wasn't showing the saved value on startup.

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3244 d7be59e3-070e-4b9a-85a1-4646befae34d
Improvements to show/hide mouse cursor.

We also need to show/hide mouse cursor when toggling fullscreen.

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3245 d7be59e3-070e-4b9a-85a1-4646befae34d