initial support for admins being allowed to perform host-only actions

[maxsupermanhd]

probably missing cleanup of NetPlay.isAdmin somewhere

Currently working:

• enables admin gui when you join with identity that is promoted to room admin
• allows swapping people around
• allows changing color of players
• allows changing team of players
• announces all the relevant actions performed by admins

TODO:

• make isAdmin dynamically change in response to admin add/remove on host (as well as identity swaps)
• action announce announcing regular not admin requiring actions like changing color of self or changing own positions to empty ones
• moving in/out of spec (needs to be allowed) (very cursed, needs big rework)
• room settings like alliance/scav/power/base needs to be allowed (needs new netmessages)
• room name change needs to be allowed (needs new netmessages)
• some button to trigger host quit (must be with a double click / with some key pressed or with confirm dialogue)