Bots should shoot each other in a game of deathmatch

[AdamTadeusz]

To reproduce:

Implement the fix in #1418 so the game doesn't crash
set sv_neo_gamemode_enforcement to 1
launch a map (I used ntre_bullet_tdm)
Join a team that's not TEAM_UNASSIGNED

What should happen:
Bots will fight each other

What actually happens:
Bots run around peacefully (unacceptable)

[sunzenshen]

In experimental branch #1553 , bots do attack each other, but bots on the same team see each other with xray highlighting, and when they score kills on each other they lose points. Also in retrospect I think my cloak detection code did not anticipate that hostile bots would be on the same team, so I'll make that change.