changed Host_Init to execute configs only once

changed Host_Init to execute configs only once
cleaned up Host_Init (and related functions like Con_Init, COM_Init, Cbuf_Init, etc) a great deal
now uses host_framecount >= 3 checks instead of host_loopactive or host_initialized checks, this should fix any problems with crashes erasing config.cfg
VID_Open and friends are now called from Host_StartVideo which is called by SCR_BeginLoadingPlaque (such as by SV_SpawnServer) as well as the end of Host_Init, this only calls them the first time it is called, so it can be called during config parsing (such as +map start on the commandline)
moved sys_usetimegettime and dedicated server console opening in sys_wgl.c into Sys_InitConsole and Sys_Init_Commands functions called by Host_Init
merged Sys_Shared_EarlyInit and Sys_Shared_LateInit into Host_Init
got rid of sys_usetimegettime (windows-only) cvar in sys_sdl.c
changed type of a number of vid_* variables from int to qboolean
renamed vidmode_active to vid_isfullscreen in vid_glx.c for more code consistency
fixed a bug in vid_glx.c that made it grab the mouse/keyboard even when it was not the active window
no longer grabs mouse while playing demos in a window

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5235 d7cf8633-e32d-0410-b094-e92efae38249