Calin Culianu authored Dec 11, 2021 and freetrader committed Dec 11, 2021

Co-authored-by: Andrew#128 <andrew-128-github@protonmail.com>

This MR closes #333.

Summary
-------

This commit eliminates the need for git-lfs. Instead, the .raw files
have been compressed with bzip2 -9, and have been added to this
repository directly as .raw.bz2. They are about 40% smaller compressed than
uncompressed.
The build script convert-raw-files.py has been modified to know how to
uncompress the data before generating C++ code for embedding.  The data
is now encoded as a base64 string in the C++, and is decoded at most
once the first time the data is read by client code. The base64 encoding
is much more efficient than the wasteful \XXX octal encoding that was
used before. It's about ~3 times more compact than previous, which should
lead to faster compilation times for bench_bitcoin.
A build step was added for the bench_bitcoin target which runs the
script to generate the data .cpp files (which get compiled into
bench_bitco...