add int_val field to cvar_t. this should be used instead of value for
boolean / integral values (no conversions done yet).
in_*.c:
Add IN_HandlePause
vid_*.c:
Add VID_HandlePause
context_x11.h vid_glx.c vid_x11.c context_x11.c:
move some common code out of vid_*.c into context_x11.c. Also, disable
the screen saver while nuq is running. NOTE: while vid_glx.c compiles,
it has not been tested yes as glx crashes this machine :(