Fix to build ps2_mouse with both LUFA and PJRC

- change API of ps2_mouse; ps2_mouse_task()
- remove mouse_report from host.c

common/action.h

@@ -64,7 +64,6 @@ void unregister_mods(uint8_t mods);
 //void set_mods(uint8_t mods);
 void clear_keyboard(void);
 void clear_keyboard_but_mods(void);
-bool sending_anykey(void);
 void layer_switch(uint8_t new_layer);
 bool is_tap_key(key_t key);