py-rarfile: updated to 3.3

rarfile v3.3

Fixes:
Add the .sfx test files to MANIFEST.in for inclusion in pypi tarball.
Add all files in git to tarball.

rarfile v3.2

New features:
Support unar as decompression backend. It has much better support for RAR features than bsdtar.
Support SFX archives - archive header is searched in first 2MB of the file.
Add HACK_TMP_DIR option, to force temp files into specific directory.

Fixes:
Always use "/" for path separator in command-line, gives better results on Windows.

Cleanups:
Drop module-level options from docs, they create confusion.
Drop support for Python 2 and 3.5 and earlier. Python 2 is dead and requiring Python 3.6 gives blake2s, stdlib that supports pathlib, and ordered dict without compat hacks.
Replace PyCrypto with PyCryptodome in tests.
Use Github Actions for CI.

(adam)