refactor: name some magic numbers in bg_pmove

code/game/bg_public.h

@@ -46,8 +46,11 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #define	VOTE_TIME			30000	// 30 seconds before vote times out
 
+#define PLAYER_WIDTH		15
 #define	MINS_Z				-24
+#define DEFAULT_HEIGHT		32
 #define	DEFAULT_VIEWHEIGHT	26
+#define CROUCH_HEIGHT		16
 #define CROUCH_VIEWHEIGHT	12
 #define	DEAD_VIEWHEIGHT		-16