Release v0.2.1

This update internally changes a lot.

NQMItems now must be classified into a group.
Added a fake creative menu for better testing and ease of access.
Particles and Projectiles are now split into 3 different class types.

• No prefix means the object supports no entities being linked normally
• Simple means it supports one entity
• Complex supports multiple entities
  Added an inbuilt yaw rotation for the entities visually in both.

Both Projectiles and Particles are now spawned by just making a new object instead of through their handlers.
The Particle and Projectile ticker are now always running.
Fixed issue with performance involving entities sometimes sticking around when they shouldn't.