Tidy up entity geometry stuff:

- Add a getCentre method for entities to GeometryUtils
- Replace getPositionEyes(0) with getPositionEyes(1) since it's more efficient, and by definition they must be the same
- Remove all the silly getEntityBoundingBox().minY stuff, this bug has been fixed since 1.8! (which begs the question: if it was considered a bug, how on earth did it go unfixed for that long?)
- A few other small things

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

@@ -121,7 +121,7 @@ public class EntityHammer extends EntityMagicConstruct {
 						ParticleBuilder.create(Type.LIGHTNING).pos(posX, posY + height - 0.1, posZ) .target(target).spawn(world);
 
 						ParticleBuilder.spawnShockParticles(world, target.posX,
-								target.getEntityBoundingBox().minY + target.height, target.posZ);
+								target.posY + target.height, target.posZ);
 					}
 
 					target.playSound(WizardrySounds.ENTITY_HAMMER_ATTACK, 1.0F, rand.nextFloat() * 0.4F + 1.5F);

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

@@ -81,7 +81,7 @@ public class EntityLightningSigil extends EntityScaledConstruct {
 								.pos(0, target.height/2, 0).target(secondaryTarget).spawn(world);
 								
 								ParticleBuilder.spawnShockParticles(world, secondaryTarget.posX,
-										secondaryTarget.getEntityBoundingBox().minY + secondaryTarget.height / 2,
+										secondaryTarget.posY + secondaryTarget.height / 2,
 										secondaryTarget.posZ);
 							}
 

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

@@ -53,7 +53,7 @@ public class EntityStormcloud extends EntityScaledConstruct {
 					}else{
 						ParticleBuilder.create(Type.LIGHTNING).pos(target.posX, posY + height/2, target.posZ)
 								.target(target).scale(2).spawn(world);
-						ParticleBuilder.spawnShockParticles(world, target.posX, target.getEntityBoundingBox().minY + target.height, target.posZ);
+						ParticleBuilder.spawnShockParticles(world, target.posX, target.posY + target.height, target.posZ);
 					}
 
 					target.playSound(WizardrySounds.ENTITY_STORMCLOUD_THUNDER, 1, 1.6f);