Improve the build process

[ix]

Right now the user has to run a Makefile to generate a ROM.

This isn't ideal, and we'd also like to customize some of the metadata contained inside the output ROM, such as the name of the game.

We also would like to provide a browser-based live programming environment, where code can be entered, built and the results be run automatically next to the code window. The user would also have the option of saving the built ROM. As a stretch, having debugging and introspection features would be nice too.