[Feature request] Friend/foe "diplomatic status" lens

[angelolocritani]

I'm not sure it would be doable, but a lens showing friend/foe territory would help a lot: when waging war, it's not easy for me to remember if that city-state is my friend or my enemy and right now I found no way to know.

A simple lens with my territory in green, my allies' one in cyan and my enemy's one in red (or something similar) would help a lot