Add proper support for damaging with different DamageCause

[NeumimTo]

While ms supports this, current implementation is not well made.

https://github.com/TheComputerGeek2/MagicSpells/blob/main/core/src/main/java/com/nisovin/magicspells/spells/targeted/PainSpell.java#L91-L97

it fires additional event, rather than attempting to modify edby event that would fire from craftbukkit.

Unfortunately spigot/paper api do not support damaging with custom damage cause, for now you will have to use nms. LivingEntity#hurt

Theres ongoing pr that you might either wait for to get merged (if it ever gets merged), or use it as a reference whats needed to be done https://github.com/PaperMC/Paper/pull/7423

[Chronoken]

Waiting for the Paper Registry API to complete this.