Rewrote Warzone#handleDeath

NEEDS TESTING
Merge remote-tracking branch 'origin/rewrite/death' into develop
Moved death message handling to warzone class

The more interesting change I made here was the removal of the so-called 're-killing' statements - e.g. setting the health of really dead players to 0 to ensure they are dead. Who knows, it might affect #796 and #778, because I have zero idea what is causing them.
Fix fire burning after respawn

Whoever wrote the note in LoadoutResetJob about stopping fire knew what
he was talking about. Sadly `git blame` shows nothing due to a refactor.
However, this job was still being run in sync, therefore doing nothing.
So I added a new job that is ran a tick later to clean up.