Added PCH-free CMakeFiles for JASP & JAGame. The vcxproj files still work, too, for those who want PCH.

JK2Game's PCH fuckery is utterly weird. There's a CMakeLists.txt for it but the resulting project does not compile.
Merge branch 'master' of github.com:Razish/OpenJK
Updated the VC filters in JKA SP so they're more consistent (hint: BG stuff shouldn't be spread between cgame/game filters)
SP: Massive reorganization of the weapon code (JKA only) and changed the window title/resources to properly reflect OpenJK.
SP: Applied commit 0e11502 to JK2. Also fixed a crash in JK2 mode where entering the mouse droid/R5 droid would crash the game.
Fixed issue #98, and fixed the SP project files on Release mode.