World Game Update v0.0.0.5

Another update to World Game!

• Added air control for Test Entity to prevent it from moving extremely fast while mid-air.
• Added Death animation for Test Entity
• Test Entity will now have a 50% chance of jumping every second.
• Fixed bug where Knockback wasn't working at all.
• Attempted to fix issue with entity and player where sometimes collider gets stuck between chunk border. (still needs work)
• [back-end] Separated model/animation code of Test Entity into a different class for reusability.
• [back-end] All entities (including player) now share yaw and headPitch variables.

[back-end] = Features not really added to the game, but is inside the game's code.

Please if you find any bugs, report it. Have Fun with the newly fixed Test Entity Animation and Physics! :)