Draw a Static Background

[RobDavenport]

Currently, we only draw a single color background (the clear color :D)

We should have a static background image! This shouldn't be too hard to do with the following outline:

• Get a background art asset (should be the same size as the game's resolution). Should be limited to 64 colors due to palette limitations.
• Import said image into the editor as a new sprite sheet & sprite
• Remove the call to clear_screen and replace it with...
• Draw the background image! Before players of course