[Feature Request] Core Game Loop

[russella26]

Create an update function that can update the game state, and a loop that allows the player to move within the game.

[russella26]

@jakesavi feel free to edit the description to better reflect your implementation

[jakesavi]

Better improved default constructors for all mobiles. Now an update function for every entity needs to be executed.

[jakesavi]

Better improved default constructors for all mobiles. Now an update function for every entity needs to be executed.

See the TODO in the update function.