BLK-191 Performance

BLK-191

This branch uses python's `struct` module to parse the data packet, rather than parsing it manually with python. It represents a significant performance boost.

This change has been verified to work with twitter and temperature regulate. More verification is necessary. This pull requests exists for code review while we test.

I am planning on using the struct guideline to create unittests that create fake data to throw at the opto.
Ok, but changing anything would be different than Matt's code. Feel free to experiment!