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/projectile/EntityDarknessOrb.java

@@ -14,30 +14,14 @@ import net.minecraft.world.World;
 
 public class EntityDarknessOrb extends EntityMagicProjectile {
 	
-	public EntityDarknessOrb(World par1World){
-		super(par1World);
-	}
-
-	public EntityDarknessOrb(World par1World, EntityLivingBase par2EntityLivingBase){
-		super(par1World, par2EntityLivingBase);
-	}
-
-	public EntityDarknessOrb(World par1World, EntityLivingBase par2EntityLivingBase, float damageMultiplier){
-		super(par1World, par2EntityLivingBase, damageMultiplier);
-	}
-
-	public EntityDarknessOrb(World par1World, double par2, double par4, double par6){
-		super(par1World, par2, par4, par6);
+	public EntityDarknessOrb(World world){
+		super(world);
 	}
 
 	@Override
-	protected float getSpeed(){
-		return 0.5F;
-	}
-
-	@Override
-	protected void onImpact(RayTraceResult RayTraceResult){
-		Entity target = RayTraceResult.entityHit;
+	protected void onImpact(RayTraceResult rayTrace){
+		
+		Entity target = rayTrace.entityHit;
 
 		if(target != null && !MagicDamage.isEntityImmune(DamageType.WITHER, target)){
 			float damage = 8 * damageMultiplier;
@@ -79,10 +63,8 @@ public class EntityDarknessOrb extends EntityMagicProjectile {
 		this.motionZ /= 0.99;
 	}
 
-	/**
-	 * Gets the amount of gravity to apply to the thrown entity with each tick.
-	 */
-	protected float getGravityVelocity(){
-		return 0.0F;
+	@Override
+	public boolean hasNoGravity(){
+		return true;
 	}
 }