Version numbering:

  12.YYYY.MM

Since all current builds are 12, I only specify the YYYY.MM part.

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For 2018.3 I'm focusing on:

- cleaning up the build scripts
- cleaning up the source tree
- making it easier to package / install
- setting the stage for the return of a standalone RETRO system
- general bug fixes
- documentation improvements

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I think I may move to a longer (2 month) release cycle. This will give
more time to refine things and reduce maintenance headaches for
packaging.

So releases in 2018 should be:

  1 / 3 / 5 / 7 / 9 / 11

I expect to make releases near the end of the month.