Button images should respect aspect ratio.

[StrikerTheHedgefox]

I'd like to request that images on buttons respect the aspect ratio of the image, fitting it into closest axis of the containing button, rather than stretching to the entire space.

Example of what I mean:

The images stretch horizontally, instead of staying their intended ratio.

[RobLoach]

💯... As it is currently, the Nuklear image system is pretty terrible. There was some incredible work on it over at Immediate-Mode-UI/Nuklear#466

We may be able to do some manipulation and hacks to get around it in here, though I'm not sure how hacky we want to get. What do you think?

[StrikerTheHedgefox]

Hmm, honestly, whichever works best for you. Would be lovely to see that PR merged, as it looks like it has everything I could ever need. As far as hacks are concerned, how egregious are we talking here? If it's not too bad, I'd accept anything.