The "Red Alert" color is currently hard-coded, which causes problems in
themes. It also has an Enum value of 0, which precludes using this
value as "unset". We also use Error, Warning, and Info colors that are
part of the Info Editor. This PR moves these out of the Info Editor
and into the "State" part of the theme. And then makes TH_REDALERT use
the TH_ERROR color.
Pull Request: https://projects.blender.org/blender/blender/pulls/131127
5956752eb7