Add midnight black theme

[Den1136]

Please, add midnight black theme. This will improve the battery consumption. There's only gray and white for now.

[rkkr]

Just Appearance -> Set custom keyboard color -> #000000

[Den1136]

@rkkr thanks, i didn't notice, but now another question, how do i access clipboard? I found info from a pull request that it can be accessed by long pressing comma, but i don't see it there. Does it need to be enabled from somewhere in settings or what?

[rkkr]

#488 is not merged. It still needs work and there are other more important things in line.