Scale the text colour on the difficulty badge.

[AndyShiue]

Scale text colour on the difficulty badge for maps with really high SR. The below images explain all:

before:

after:

I cannot really play maps with SR>6.5 so this is not really useful for me. However it's really cool so I did it :)
I guess directly specifying the color attribute of the difficulty badge would not be a good idea but I don't know what's the right way yet. It's so welcome if someone can point out how to fix it.
If this idea eventually become appreciated, it's also fine to bikeshed on how the colour spectrum should be.

[bdach]

Judging by the fact that @peppy has historically been on record saying that star rating should basically never be allowed to exceed 10, I don't think we want any of this.

[AndyShiue]

Ok then because I just did it for fun