Add method for clearing buffer

Describe the Enhancement Part of #69 allows the upload buffer to be restored after a reset event. When we're testing the firmware "random" value can be inserted onto the fram that can polute future data. Starting this thread with potential ways to having methods of resetting the buffer before deployments.

Benefits

• Prevent random data from being uploaded to key "cells" on dirtviz. Minimize post processing requirements.

Possible Drawbacks

• Added software/hardware complexity
• User error removing data

Additional Context I've though of the following:

• Adding hardware button that clears the FRAM buffer
• Button on GUI that clears the buffer

I'm leaning towards the GUI software implementation. When the board is configured it can be reset at the same time.