Implement custom bukkit's entity for modded projectiles

Fix #150

src/main/java/kcauldron/entity/CustomProjectileEntity.java

@@ -0,0 +1,48 @@
+package kcauldron.entity;
+
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Projectile;
+import org.bukkit.projectiles.ProjectileSource;
+
+import net.minecraft.entity.Entity;
+import net.minecraftforge.cauldron.entity.CraftCustomEntity;
+
+public class CustomProjectileEntity extends CraftCustomEntity implements Projectile {
+    private ProjectileSource shooter;
+    private boolean doesBounce;
+
+    public CustomProjectileEntity(CraftServer server, Entity entity) {
+        super(server, entity);
+    }
+
+    @Override
+    public LivingEntity _INVALID_getShooter() {
+        throw new IllegalStateException("Not implemented!");
+    }
+
+    @Override
+    public ProjectileSource getShooter() {
+        return shooter;
+    }
+
+    @Override
+    public void _INVALID_setShooter(LivingEntity shooter) {
+        throw new IllegalStateException("Not implemented!");
+    }
+
+    @Override
+    public void setShooter(ProjectileSource shooter) {
+        this.shooter = shooter;
+    }
+
+    @Override
+    public boolean doesBounce() {
+        return doesBounce;
+    }
+
+    @Override
+    public void setBounce(boolean doesBounce) {
+        this.doesBounce = doesBounce;
+    }
+}

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

@@ -172,7 +172,9 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         else if (entity instanceof net.minecraft.entity.item.EntityTNTPrimed) { return new CraftTNTPrimed(server, (net.minecraft.entity.item.EntityTNTPrimed) entity); }
         else if (entity instanceof net.minecraft.entity.item.EntityFireworkRocket) { return new CraftFirework(server, (net.minecraft.entity.item.EntityFireworkRocket) entity); }
         // Cauldron - used for custom entities that extend Entity directly
-        else if (entity instanceof net.minecraft.entity.Entity) { return new CraftCustomEntity(server, (net.minecraft.entity.Entity) entity); }
+        else if (entity instanceof net.minecraft.entity.Entity) {
+            if (entity instanceof net.minecraft.entity.IProjectile) return new kcauldron.entity.CustomProjectileEntity(server, entity); // KCauldron
+            return new CraftCustomEntity(server, (net.minecraft.entity.Entity) entity); }
 
         throw new AssertionError("Unknown entity " + entity == null ? null : entity.getClass() + ": " + entity); // Cauldron - show the entity that caused exception
     }