Fix Craft Entity constructors and toStrings.

Also, standardise getHandle and clean up in general.
getHandle is now using the 'entity' member variable instead of
super.getHandle, as this reduces the number of chained calls needed.

src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java

@@ -13,47 +13,51 @@ public class CraftFireball extends AbstractProjectile implements Fireball {
         super(server, entity);
     }
 
-    @Override
-    public String toString() {
-        return "CraftFireball";
-    }
-
     public float getYield() {
-        return ((EntityFireball) getHandle()).yield;
+        return getHandle().yield;
     }
 
     public boolean isIncendiary() {
-        return ((EntityFireball) getHandle()).isIncendiary;
+        return getHandle().isIncendiary;
     }
 
     public void setIsIncendiary(boolean isIncendiary) {
-        ((EntityFireball) getHandle()).isIncendiary = isIncendiary;
+        getHandle().isIncendiary = isIncendiary;
     }
 
     public void setYield(float yield) {
-        ((EntityFireball) getHandle()).yield = yield;
+        getHandle().yield = yield;
     }
 
     public LivingEntity getShooter() {
-        if (((EntityFireball) getHandle()).shooter != null) {
-            return (LivingEntity) ((EntityFireball) getHandle()).shooter.getBukkitEntity();
+        if (getHandle().shooter != null) {
+            return (LivingEntity) getHandle().shooter.getBukkitEntity();
         }
 
         return null;
-
     }
 
     public void setShooter(LivingEntity shooter) {
         if (shooter instanceof CraftLivingEntity) {
-            ((EntityFireball) getHandle()).shooter = (EntityLiving) ((CraftLivingEntity) shooter).entity;
+            getHandle().shooter = (EntityLiving) ((CraftLivingEntity) shooter).entity;
         }
     }
 
     public Vector getDirection() {
-        return new Vector(((EntityFireball) getHandle()).dirX, ((EntityFireball) getHandle()).dirY, ((EntityFireball) getHandle()).dirZ);
+        return new Vector(getHandle().dirX, getHandle().dirY, getHandle().dirZ);
     }
 
     public void setDirection(Vector direction) {
-        ((EntityFireball) getHandle()).setDirection(direction.getX(), direction.getY(), direction.getZ());
+        getHandle().setDirection(direction.getX(), direction.getY(), direction.getZ());
+    }
+
+    @Override
+    public EntityFireball getHandle() {
+        return (EntityFireball) entity;
+    }
+
+    @Override
+    public String toString() {
+        return "CraftFireball";
     }
 }