Improve the pvp combat logging

[CraftedMods]

• Add a detection for the start/end of combat events (and who hit first)

• Add more data (like the actual dealt and not only the applied damage)

• Log canceled combat events (player [...] tried to attack [...] but it was canceled). Configurable!

• Register teleport events too during combat

This class could help us for this: net.minecraft.util.CombatTracker.
This requires definition of 'combat event timers' in some way.

[AlteOgre]

Add configurable registration of log on/off events, afk on/off events and teleportation events.

[DwarfyAssassin]

Only log in certain worlds. (config option)