release 2019.9.1

This is the first major release of the modern GreatFET software and firmware stacks. It includes firmware images (in firmware-bin) and host software (in host-packages), as well as a copy of all sources necessary to build the entire codebase.

NOTE: The recommended way to update your GreatFET for this release is to install the host tools (either from the host-tools folder or from pip), and then to use "greatfet firmware --autoflash". This will ensure that your firmware and host tools match, which is the best way to make sure everyone gets along.

This version adds a significant number of features -- it'd be prohibitive to list them all here! Checkout the RELEASENOTES file in the archive for more information.