Use CARD32 instead of Atom, move geom headers in

Use CARD32 instead of Atom, move geom headers in

Use CARD32 instead of Atom/KeySym/et al to avoid type size confusion
between server and non-server code; relatedly, move the geometry headers
in from kbproto, so every non-simple type (i.e. structs containing
nothing more than basic types) is now copied into xkbcommon.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>