Implement blast modifier support for all applicable constructs, plus misc construct-related cleanup and fixes

src/main/java/electroblob/wizardry/entity/construct/EntityArrowRain.java

@@ -1,17 +1,23 @@
 package electroblob.wizardry.entity.construct;
 
+import electroblob.wizardry.registry.Spells;
+import electroblob.wizardry.spell.Spell;
 import net.minecraft.entity.projectile.EntityTippedArrow;
 import net.minecraft.init.Items;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.world.World;
 
-public class EntityArrowRain extends EntityMagicConstruct {
+public class EntityArrowRain extends EntityScaledConstruct {
 
 	public EntityArrowRain(World world){
 		super(world);
-		this.height = 3.0f;
-		this.width = 5.0f;
+		setSize(Spells.arrow_rain.getProperty(Spell.EFFECT_RADIUS).floatValue() * 2, 5);
+	}
+
+	@Override
+	protected boolean shouldScaleHeight(){
+		return false;
 	}
 
 	public void onUpdate(){
@@ -19,14 +25,21 @@ public class EntityArrowRain extends EntityMagicConstruct {
 		super.onUpdate();
 
 		if(!this.world.isRemote){
-			EntityTippedArrow arrow = new EntityTippedArrow(world, this.posX + rand.nextDouble() * 6 - 3,
-					this.posY + rand.nextDouble() * 4 - 2, this.posZ + rand.nextDouble() * 6 - 3);
+
+			double x = posX + (world.rand.nextDouble() - 0.5D) * (double)width;
+			double y = posY + world.rand.nextDouble() * (double)height;
+			double z = posZ + (world.rand.nextDouble() - 0.5D) * (double)width;
+
+			EntityTippedArrow arrow = new EntityTippedArrow(world, x, y, z);
+
 			arrow.motionX = MathHelper.cos((float)Math.toRadians(this.rotationYaw + 90));
 			arrow.motionY = -0.6;
 			arrow.motionZ = MathHelper.sin((float)Math.toRadians(this.rotationYaw + 90));
+
 			arrow.shootingEntity = this.getCaster();
 			arrow.setDamage(7.0d * damageMultiplier);
 			arrow.setPotionEffect(new ItemStack(Items.ARROW));
+
 			this.world.spawnEntity(arrow);
 		}
 	}