Added player and more!

[Zac8668]

This PR is kinda big, we added:

• Actors
  • AABB colliders that interact with the atom world.
• Player
  • The player is pretty cool! It has some animations, a jetpack and a pretty nice tool!
  • Player tool
  • The tool can suck atoms(Left Mouse Button), and also shoot(Right Mouse Button) the atoms you sucked!
• Engine Changes
  • We changed the Chunk Manager approach to store Chunks in a Vec to storing them in a HashMap, this lays the ground for future updates, like Save/Load worlds, and big explorable worlds. It was needed to simplify addind the other additions and unfortunately took some time to do.