This patch has been removed from 0.12.5 to avoid a protocol change when preparing for the release.
It will be part of version 14 when the protocol is updated and is able to deal with new game parameters.
This patch was part of the very first commits to 0.12.5, but the protocol number (and compatibility rules) were not updated.
I'm still postponing this patch. Only when it is sensible to have colored dice (e.g. when a meaning is added to separate dice) this patch stays here instead of in the code.