More radio chatter and AI barks

[caligari87]

I've always wanted to do something like this, even have a bunch of aborted QB64 code for it with call-signs and whatnot.

Ideas:

• Marines can ask for or broadcast status updates.
• Marines can get bored and will send more conversational chatter.
• Can talk about health, ammo, current target, patrol target, current state, recent combat, things they see.

Will update this with ideas. No promises it'll be done anytime soon.