v0.3

Release Notes:

• Bootloader: Fix Programming-Jumper detection
• Read Track: Various minor fixes
• SCP: Fix the SCP file headers generated by "gw.py read"

IMPORTANT USER INSTRUCTIONS:

• Users must serial-update using the v0.3 HEX file
  • DO NOT update from v0.2 using the UPD file
• May need to install the crcmod package: eg "pip3 install crcmod"