Python-lancelot

fixes:
- flirt: fix matching buffers that are shorter than some patterns
- flirt: fix byte pattern size computation
- flirt: fix tail byte matching

overall, this makes parsing of FLIRT .pat files more robust. motivated by the work in https://github.com/fireeye/capa/issues/435.

adds:
- FLIRT: pat: line comments (extension of format, enables license headers)
- FLIRT: pat: parse tail bytes
- FLIRT: pat: handle large functions (greater than u16::MAX. this contradicts existing documentation of the FLIRT format!)

changes:
- use decision tree to index FLIRT patterns, rather than RegexSet, for much better performance

more ci juggling

removes:
- python bindings for py3.5

adds:
- python bindings for py3.9

doing the release dance, sorry.

fixes:
- version number

fixes:
- hopefully CI push of python packages