this commit adds video mode switching, and preferred mode is saved to config, no...

this commit adds video mode switching, and preferred mode is saved to config, no more need for -window/-width/-height/-bpp (they still work)
IN_Init and IN_Shutdown code has been merged into VID_InitMode and VID_Shutdown code in each of the video systems
VID_InitCvars renamed to VID_Shared_Init
VID_Open and VID_Close functions added in vid_shared, Host_Init now calls VID_Open
S_Open/Close and CDAudio_Open/Close added (none of these do anything yet)
VID_Open and VID_Close call R_Modules_Start, S_Open, and CDAudio_Open and their corresponding Close functions
VID_Restart_f added (vid_restart command)
vid_hidden now starts true (to avoid any refreshs until video is started)
vid_fullscreen/width/height/bitsperpixel are now saved to config
VID_Open is called after configs are parsed
Render_Init now longer starts/stops modules
IN_MouseEvent in vid_wgl.c no longer clamps pitch (since that's done by IN_PostMove)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2442 d7cf8633-e32d-0410-b094-e92efae38249