Initial win32 fullscreen fixes
- send lost ALT keyup event after closing notification message box
- disable border of simulation window in fullscreen mode
- TODO #1: fix window sizes after leaving fullscreen mode
- TODO #2: add screen size checks to avoid crash


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12332 6c8e4198-a580-4521-a02f-c9ae86df1db9