UI label enhancement - simplify add / remove actions

[cid]

There are several "Add/Remove" actions like home region, snow removal, and the especially egregious double negative that forms around "No-Roof" (e.g. "add no roof region").

Consider just simplifying these to a single 'Toggle X" for each action pair. An overlay is already shown to indicate regions modified from the default. You might add a label to the game-map overlay itself to help clarify the modified value (e.g. the label "No Roof" label floats inside non-roofed map regions.

[whell2]

Agreed, something like add roof region and remove roof region would be so much better