release 2020.1.1

This is the second 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: This is the last release that will support Python 2, as it has been retired.
Further releases will target Python 3.6+.

Some highlights of the changes include:

• in the Python API, 'peripherals' have been renamed to 'interfaces'
  • programmers have been brought out into greatfet.programmers
    • programmers are created by name: spi = gf.create_programmer('spi')
• a JTAG interface, with a command-line helper greatfet jtag
• greatfet shell now has IPython Magic, such as %reload
  • The preamble text when running greatfet shell has more information
• the DAC API and command-line helper (greatfet dac) have been rewritten
  • greatfet dac -f voltage 2.2
• bus-pirate emulation! greatfet pirate
• greatfet info now has --host to print information about the host environment
• GNU Radio 3.8 support, with ADC blocks, and other cleanups

Major bugfixes:
- #283: USB packets that are 64 byte aligned in data size are not forwarded through the usbproxy on the GreatFET One

Happy hacking!