530 fix sasquatch in binwalk docker container

Ubuntu Focal is Python 3 by default

https://wiki.ubuntu.com/FocalFossa/ReleaseNotes#Python3_by_default
Several other distros as well.

Fix: binwalk stuck when extract encrypt zip files

Call 'unzip' with empty password, to avoid 'unzip' stuck in interactive mode when process encrypt files

525 publish binwalk as a docker image

Actually implement exponent and shift operators

initial Dockerfile along with changes required for setting locale correctly inside Docker container.

deps: Fix install on newer ubuntu distros and drop python2 support.

These operators are listed in the "Signature File Format" wiki page but don't actually exist.

Autel EVO firmware magic support

Dependencies such as jefferson are now python3 only and python2 is no
longer supported, as it appears all our dependencies have python3
versions it should be safe to drop python2 support.

New and improved version.py

Added __main__.py file; updated binwalk script accordingly