v0.16

Release Notes:

• F7 Firmware: Enable over-drive voltage mode
  • Required for reliable 216MHz operation (see datasheet)
• Bootloader update:
  • gw.py update --bootloader updates the bootloader
  • Not normally required
  • Failure may brick the Weazle and require full reflash: Take care!
• Update build system to work with Windows MinGW environment