Tinyaes

- added release Python 3.9 on Windows, Linux (manylinux1) and OSX
- updated upstream tiny-AES-c with some cleanups and small optimizations

- release Python 3.6 OSX and Windows wheels
- updated upstream [`tiny-AES-c`](https://github.com/kokke/tiny-AES-c) with some code changes

Same as 1.0.0a3 but with added CI jobs for tests and publication on PyPI for Linux, Windows and MacOS (Windows binary for Python 2.7 is still missing)