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/spell/WitherSkull.java

@@ -18,7 +18,7 @@ import net.minecraft.world.World;
 public class WitherSkull extends Spell {
 
 	public WitherSkull(){
-		super(Tier.ADVANCED, 20, Element.NECROMANCY, "wither_skull", SpellType.ATTACK, 30, EnumAction.NONE, false);
+		super("wither_skull", Tier.ADVANCED, Element.NECROMANCY, SpellType.ATTACK, 20, 30, EnumAction.NONE, false);
 	}
 
 	@Override