ulti-Action and Global Key Command Buttons on/off

Provide ability to enable / disable Multi-Action and Global Key Command buttons according to an associated global property. A button so disabled would display an alternative graphic (perhaps with a default of the normal graphic greyed or crossed out).

related items:
vassalengine.org/tracker/sho … gi?id=1812
vassalengine.org/tracker/sho … gi?id=1849