VectorSet compile fix. refs #146
Removed usage of Sys_GetSystemRam(). refs #164
Precompiled headers unbound

rebased

added missing Sys_GetSystemMem

removed jpeg-6, replaced by jpeg-6b

typo fixed

fixed conditional tools building

cmakelist cleaned from precompiled

removed hardly useful Sys_GetSystemRam()

fixed ffmpeg includes for unix

frame.h deprecated on modern libavutil