Add some shortcut for select group object by directly

Now, you can select group object by Shift+G in the object mode, hope can add some shortcut for select group much more directly, for example, if you press CTRL+ALT+RMB in object mode will select object by group. if have lots groups in the scene, it's will be very easy for selected than Shift+G, and you can select by shift +G too.

Thanks!