Copy this one.
Remove the single-sample function, and rename the multi-sample one because saying 'batch' doesn't really make sense if there is no non-batch version. Closes #10.
Remove this one, to reduce the minimum complexity needed to make a simple core or front. If we want it back, we can make an env for it. Closes #11.
Almost forgot the most important change...
Replace various instances of 'rom' with 'content', per #8. However, I didn't touch the ones where rom or emulator was used as examples, or for the ones that only make sense for emulators.
Make retro_init able to fail.
Remove those three. (The comments can be removed later, as they don't affect ABI.)
Replace this with a function.