delete Cardtypes with just one delete+issues

Now you can remove cardtypes, but it takes two efforts. The first removes the extension, and the second removes the actual card. (Note, in dev mode on a local copy, it's all deleting smoothly in one try). We were seeing some problems before with cardtype's edit mode breaking when they lacked an extension, but that's been fixed.

see Can't remove or change Cardtype of Cardtype cards