Valve: Added monster_snark and monster_tripmine. Although they don't work
as such fully yet.
Pain/Death are properly part of the player class.
Added own music track networking so we can skip the looping business,
which is currently broken in the engine.
Shoved some gamerule specific stuff around so there's more shared code
between the mods.
but, as the engine-bug that's as old as time itself that has been
responsible for prediction being wonky has still not been fixed, I have
to do this. Maybe it'll be for worse, maybe it'll be for the better.
