The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

Signed-off-by: Simon Glass <sjg@chromium.org>

Bintool.version already contains everything required to get the version
out of lz4 binary so let's not override it with its own implementation.

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Convert this file to snake case and update all files which use it.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a Bintool for this, which is used to compress and decompress data.
It supports the features needed by binman as well as installing via the
lz4 package.

Signed-off-by: Simon Glass <sjg@chromium.org>