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

This reverts commit 46f0efd3.

Add ARM64 Linux image signature

The Rijndael S-Box 

Improves speed of entropy scan

Add signature for bix firmware file format

moved entropy legend

Adding power support

Update deps.sh for Python 3 jefferson

This is used by Zyxel for the firmware in their GS1900 series switches,
but also shows up in Cisco 220 series.

It's really just the U-Boot header with a different initial magic value.

Also minor cleanup in the U-Boot signature.

Jefferson has moved to Python 3. This requires changes to `deps.sh`

Fixed bug in processing internal extractors; if extractor raises an exception, explicitly mark it as failed.

Improved speed of entropy scan by using a list rather than a dictionary for seen values
vastly improved speed with optional numpy/numba implementation