* Add Tickable interface
By having a tickable interface, we're only dedicating one thread to ticking entities and running tasks as opposed to several. This will also help with implementing world border support.
* removeEntity already clears tickableEntities for us
* Only tick the entity if it's not being ticked
* Fireball and ghast improvements
- Ghasts now visually show if they're charging a fireball
- Fireballs are now vastly better and will update better
* Add gravity and drag to projectiles
* Add check for session close and improve fireball
* Remove motion stuff from fireball
* Make fireball hittable
* Add wither skull entity
* Small changes
* Add note about laggy fireballs
Co-authored-by: David Choo <davchoo3@gmail.com>
This should make the process of translating entity metadata a whole lot easier and more organized. Future features involving entities and checking if they're capable of doing certain things should also be much easier now.