Cleaned up the mouse interface, added mouse support to VNC, and split off the VNC keymap to vnc_keymap.c with more documenting comments in that file so we can update it as we learn.

src/plat_mouse.h

@@ -3,10 +3,6 @@
 */
 
 
-extern int	mousecapture;
-extern int	mouse_buttons;
-
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -15,7 +11,6 @@ extern void	mouse_init(void);
 extern void	mouse_close(void);
 extern void	mouse_process(void);
 extern void	mouse_poll_host(void);
-extern void	mouse_get_mickeys(int *x, int *y, int *z);
 
 #ifdef __cplusplus
 }