Unfortunetly, this necessitated keeping around yet more JSON objects for
the duration of the server's runtime.
It also involved unifying the way NPC IDs are handled, such that they
may be allocated and deallocated out of order.
If any NPCID-related bugs occour, this commit should be regarded as
the prime suspect.
They currently don't expire after a set amount of time.
Attacking a sleeping monster does wake it up, but doesn't remove the
debuff status client-side yet.
* Deleted empty Player.cpp
* Moved the helper functions from the obsolete CNStructs.cpp into
main.cpp and deleted it
* Renamed CombatManager to MobManager, as that will likely become it's
main focus soon
