[RPA-1] Structural Refactor

[mikesizz]

Description

We need to start decoupling a lot of the main game logic into sensible abstractions. This will allow easier extension and debugging.

Acceptance Criteria

• Decouple game logic, player logic and input logic from the main game loop
• Allow for dynamic sprite loading
• Allow for dynamic level loading
• Derive necessary values from env file
• Begin to implement "game object" architecture such that all logic relevant to a "game object" (game world, players enemies) is self containing