Cannot customize Button foreground color

Created by: dozer75

In the new beta the color style on buttons are calculated based on the background color to be either #111 or #fff, I have NO idea why are this limited now? It's a huge limitation when compared to the earlier versions.

In all other versions we have been able to set the exact color by changing the LESS (SASS in v4 alpha) variable which was an easy way to get it exactly how we needs it, now we will have to write our own .btn-* overrides to achieve the same with risk of loosing backwardscompatiblity later.

Please bring back the ability to set color using variables as before. The new system are really frustrating to work with.