[Feature request] Disable irrelevant UI options

[davestewart]

Some of the UI options could be disabled if they are not relevant:

• "Optimize Layout" – if there are no inferredAutoLayout nodes
• "Round Values" and "Round Colors" – if no [] characters found in classes
• "Custom Colors" – if no color variable used

[bernaferrari]

I think the way I would solve this is:

"current selection doesn't make use of color variables". with a check or X. Could be useful for people.

so the button is still enabled but the user can see it won't do anything on the current selection

[davestewart]

Also, could just dim the button.

[bernaferrari]

Yeah, dim could be nice way, I like it