taskbaritem upgrade

The first three options (show, minimize, close) should apply to an entire combined group. As in show all, minimize all, close all.

Also, it would be nice to have decombine as a 7th option for value data. It's disruptive when items decombine by themselves, so a method to manually decombine is welcomed. This could act as a toggle, if possible. If not, then a group would recombine when deactivated (same as it currently works).