[Suggestion] Color facing indicators by allegience

[Zesty]

Rarely, mods will have missions with the same types of both allied and enemy units running around. This can make it really hard to distinguish friend from foe, especially when they are all ontop of each other. If you want an example try the Ancient Mummy Abode mission in Xcomfiles. My idea is to color the facing indicators you get by pressing alt depending on whether they are friend or foe. Keep the current white for Xcom units, make it red for enemies and green for friendlies.

[Yankes]

This is probably doable with scripts, as they now have access to pressed `alt` and to what faction given unit belong.