- Changed compilation for g_doom, g_heretic, g_hexen and g_strife folders

so that all files are included by a central one instead of compiling 
  each one separately. This speeds up the compilation process by 25%
  when doing a complete rebuild in Visual C.
- Cleaned up more header dependencies.

SVN r1226 (trunk)

src/ct_chat.cpp

@@ -22,6 +22,7 @@
 #include "c_console.h"
 #include "c_dispatch.h"
 #include "c_cvars.h"
+#include "d_player.h"
 #include "v_text.h"
 #include "v_video.h"
 #include "gi.h"