OTA update of STM32 (M0) nodes

[andrewgreenberg]

We need the ability to update firmware on STM32 cards on the OreSat CAN bus.

The steps are something like this:

• Create firmware update and test extensively on flatsat
• Upload firmware update file to the C3
• Confirm with the ground that the file was uploaded
• Turn on the STM32 node (if off) and transfer the file to it
• Confirm with the ground that the file was transferred to the node
• Trigger the firmware update (if it needs to be triggered? Maybe it just works? How do firmware updates over CAN even work?)
• Get the status of the update back to the ground: maybe back to the C3, through a status file, or through beaconing a version string, or both

[ryanpdx]

Blocked on task scheduler