Work on XInputGamePad class.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2413 86ba831e-150c-0410-ab35-e06eaae15ed9
More work on XInput support.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2414 86ba831e-150c-0410-ab35-e06eaae15ed9