[Tweak] Gang Base Map Icons

[tomozj]

It'd be neat if gang members who owned the gang base and were currently in the gang base had their icons hidden, so that people wouldn't know how many members are there at one point. Members could hide around the place and jump out when someone comes. Perhaps they could see each other, so they are allied as a team.

When the gang base is then attacked, their icons' status is flicked back to normal again.