Added: New boss abilities:
- Gravity Shift
Shift gravity, making players float upwards for a few seconds.
- Leap Target
The boss leaps towards the target.
- Leap Distant
The boss leaps towards a random distant player.
- Vampiric Aura
Siphon health from all nearby players.
- Raging Winds
Slowly push all players within range away from the boss for a set duration.
- Illusions
Summon clones of the boss for a time, to confuse the players.
- Healing Prism
Summon a prism to heal the boss every so often for a set duration, if within range.

Added: New boss abilities "-all", "-nearby", "-target", for the following effects:
- Poison
- Wither
- Slow (Slowness)
- Blind (Blindness)

Added: Advancing entries now support multiple waves in the same entry.
To add mutliple waves, simply split them with ','.
Changed: "/havenarena reload" now reloads MobArena as well, if "boss-abilities.enabled" is enabled in the config.
In addition it will also reload all custom abilities.

Fixed: Fixed an error when the arena ends due to a player dying.
This error never broke anything, was just spamming the console.