Tie tool to layer

[a-y-khan]

Request from Paul Holcomb:

I'm frequently trying to reconstruct 3+ objects simultaneously with no overlap, and it's very handy to have the negative constraints on the paint brush tool. Is there a quick way, like a keyboard shortcut, to switch between tools? I have 3 paintbrushes set up, one for each object, constrained by the other two, but I have to constantly go to the Tools/Filters window and switch my paintbrush. It would be nice to have some way to link specific tools to specific masks, so that when I change the mask I'm working on Seg3D knows to also change my constraints for my paintbrush or just change the paintbrush all together.

[a-y-khan]

This could be a GUI option. Will require digging into tool and layer management.