pcsx2: Create GetProgramDataDir (for cheats_ws and game db)


git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5851 96395faa-99c1-11dd-bbfe-3dabce05a288
Silencing assert for the moment as it seems to work regardless. (assert triggered since r5851)

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5852 96395faa-99c1-11dd-bbfe-3dabce05a288
Installer: Removed SDL.dll as it is no longer required by any plugins.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5853 96395faa-99c1-11dd-bbfe-3dabce05a288