Imports
- bitbucket.org/_Deus127/portal-book/ch3-foundation/engine/colorize
- bitbucket.org/_Deus127/portal-book/ch3-foundation/engine/drawer
- bitbucket.org/_Deus127/portal-book/ch3-foundation/engine/framerate
- github.com/faiface/pixel
- github.com/faiface/pixel/pixelgl
- golang.org/x/image/colornames