Clouds speed should be even more consistent across different devices.
Also made the title screen's UI backgrounds "clickable" so a misclick
doesn't hide the UI too easily.
Huge clean-up. Separation between themes and style. Preparatory work for
theme inheritance and alternative themes made by derivation.
Problem: due to a pre-lollipop bug, I still have to remove some color
indirections through attributes, as they are not preperly resolved.
