Introduce 'forgive teamkiller' system

[pridit]

The purpose of this is to self-moderate the server. The worst offense is teamkilling. An easy way to combat this is to prompt the victim with a 'forgive player' dialog system which has two outcomes.

If the player selects:

• No - the killer is kicked, as well as the GUID being stored and marked. Should the player rejoin and continue, the punishment will change from a kick to a ban should a further offense not be forgiven.
• Yes - nothing happens, and no punishment is incurred. The victim is also revived.

If the aforementioned cannot be implemented in the state as described, then at a minimum teamkilling should be logged for review later.

[pridit]

Irrelevant due to being able to negate player on player damage