Fixed #119.
Merge pull request #124 from xycaleth/master

Just fixing issue #119 and cmake not using game.def in SP DLL.
Initial modular renderer commit. Breaks Mac + Linux + Cmake builds. Please wait for future commits =]
Works on Windows with: client (modular rd), listen server (modular rd), dedicated server (static rd)
Merge branch 'master' of https://github.com/Razish/OpenJK
Fixed error in PNG_Pack that caused PNG_Save to fail
Added timestamps to screenshot filenames. Added screenshot_png. Fixed r_aviMotionJpegQuality and r_screenshotJpegQuality not being initialised
Adjust some cvar defaults and limits as noted in #70
Attempt to synchronise snapshots/sec with server framerate
merging modular render in
Messy changes towards modular renderer on OSX/Linux