Place team number next to spawn on minimap in lobby,

[Jimather]

So it's really annoying having to slowly mouseover every spawn point in the minimap before hitting ready to check teams are sensibly located.

Surely it wouldn't be too hard to put the team number associated with the person at that spawn point next to it?

[abcdefg30]

See https://github.com/OpenRA/OpenRA/issues/5715 .