osx: Ignored Snow Leopard user and build files.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2405 86ba831e-150c-0410-ab35-e06eaae15ed9
* Ability to use RTTIObject with abstract classes by making the virtual factory construction facility optional.
* Additional work on new gamepad HAL and SDL game pad support refactor.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2406 86ba831e-150c-0410-ab35-e06eaae15ed9