- add MAGIC_MIME_TYPE constant, use that in preference to MAGIC_MIME internally.
This sets up for a breaking change in a future major version bump where
MAGIC_MIME will change to mathch magic.h.
- add magic.version() function to return library version
- add setparam/getparam to control internal behavior
- increase internal limits with setparam to prevent spurious error on some jpeg files
- various setup.py improvements to declare modern python support
- support MSYS2 magic dlls
- fix warning about using 'is' on an int in python 3.8
- include tests in source distribution
- many test improvements:
-- tox runner support
-- remove deprecated test_suite field from setup.py
-- docker tests that cover all LTS ubuntu versions
-- add test for snapp file identification
- doc improvements
-- document dependency install process for debian
-- various typos
-- document test running process