Clean up the code

[schwal10]

Clean up the code. There are a lot of places where the coding could be better and simpler. Example: handling collisions/collision sounds

[schwal10]

• [x] Clean up handling collisions/collision sounds
• [x] Handling of player powerups
• [x] Move each object into its own file

[jackinloadup]

Just saw your fork here. Amazing work! :+1:

[schwal10]

@jackinloadup Thanks! I plan on creating a pull request into your repository with what I have so far once I clean up the code a bit more.

[schwal10]

Code has been refactored so that objects have their own files, making the code easier to maintain.