Spell hierarchisation and refactoring, plus miscellaneous renaming and minor refactoring

- Adds new generic spell superclasses which aim to group spells such that duplicate code is eliminated, and functions standardised, as much as possible.
- Removes numerous spell classes which are no longer required as a result of this change, and replaces them with instances of the relevant generic spell classes.
- Changes the remaining spell classes to fit with the new system, mostly by having them extend the generic spell classes.
- Completes the transfer of particle spawning to the ParticleBuilder system.

src/main/java/electroblob/wizardry/entity/living/ISummonedCreature.java

@@ -130,6 +130,14 @@ public interface ISummonedCreature extends IEntityAdditionalSpawnData {
 	default EntityLivingBase getCaster(){
 		return getCasterReference() == null ? null : getCasterReference().get();
 	}
+	
+	/**
+	 * Sets the EntityLivingBase that summoned this creature. <i>This is the correct method to use to set the owner of
+	 * this summoned creature.
+	 */
+	default void setCaster(@Nullable EntityLivingBase caster){
+		setCasterReference(new WeakReference<EntityLivingBase>(caster));
+	}
 
 	// Miscellaneous