Added smart remove counter, counter remove dialog.

Previously, there was no easy way to remove loyalty counters or things like divinity or quest counters. 

Now there is a dialog box similar to the add counters dialog. Also, there is a menu item to smart-remove
counter. It was simple enough to add, if there are any problems with my implementation let me know. There's not really much documentation on OCTGN modules. :)

Hope you accept the request. I'm new to github and I'm a huge magic / OCTGN fan.