Adapt the sanitized pointer handling, discussed at #17196 :
X11 driver specific changes:
make sure pointer position is always within [-0x7fff,0x7fff] by using the confined wrapper
remove extra "inside" checks, general simplification
enable pointer offscreen reporting
Udev driver specific changes:
remove custom calculation and use common viewport translation
unify pointer query instead of separate _x and _y
enable pointer offscreen reporting
Other changes:
more tuning of pointer conversion in video_driver.c for edges
lightgun button ID conversion moved to input_driver.c
6a85844b41