New skin colors, add support for preferred opposite color to save cards, new lua features.

Merged SteelT requested to merge the-colors-feel-so-right into next

In collaboration with MotorRoach and bit of guidance from toaster, this adds six new skin colors. Which are as follow

srb20126 srb20127 srb20128 srb20129 srb20130 srb20125

This branch also adds support for prefoppositecolor to save cards, and exposes two Lua functions for use in scripts.

Merge request reports