menu.c - changed M_DrawSlider to take a value and a min/max range, now prints the...

menu.c - changed M_DrawSlider to take a value and a min/max range, now prints the current value of the cvar as well
menu.c, menu.h, gl_draw.c - added new color control options menu (the gl_draw.c change is merely adding a "ditherpattern" texture)
menu.c - added "Delay refresh (faster)" to options menu (gl_delayfinish cvar)
menu.c - added "Game Speed" to options menu (slowmo cvar)
vid_wgl.c, vid_glx.c, vid_null.c, vid_shared.c, vid.h, palette.c, palette.h, host.c - gamma system redesigned (VID_SetGamma now takes ramps, VID_GetGamma added, other cruft removed), moved VID_UpdateGamma to vid_shared.c, gamma is now turned off when darkplaces is minimized in X11 (unmapped), and when it's window is not active in Windows as well
vid_wgl.c - trailing whitespace fixed
vid_shared.c - added v_color_enable, v_color_black_[rgb], v_color_grey_[rgb], and v_color_white_[rgb] cvars as another way to adjust color settings
gl_draw.c - added support for v_color_* cvars, removed support for darkening screen (not possible to do in color)
vid_glx.c - got rid of unfinished X11 colormap based gamma code (using XF86 VidMode extension instead)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2813 d7cf8633-e32d-0410-b094-e92efae38249