Enable multi-controller coordination

[cbteeple]

Description of changes

• Created "command specification" files to save metadata about all commands. This can also be used by the ROS driver in the future, so there will be one canonical source for commands. This fixes Issue #4 .
• Refactored the entire backend to split up commands to several devices in the background. The user workflow doesn't change at all. This fixes issue #3 .
• Redefined the hardware configuration to enable easy extension to multiple devices.
• Added realtime data parsing from the datastream sent back from the controller. The parsed data is saved in an intelligent form rather than just dumping the raw text into a file. This will break the data plotting script, but will facilitate an easy replacement.

Motivation and Context

If we have a few control boards, we should be able to combine all the channels together and coordinate them.

Testing

Tested on real hardware, and confirmed commands are correctly split between several pressure controllers.

Testing Environment:

• OS: Ubuntu and Mac OSX

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have tested this code on real hardware.
• [x] I have updated the documentation accordingly.

[cbteeple]

There's an extra "serial_config.py" file that doesn't get used anymore, and the naming of the "hardware_config.py" file is confusing with the hardware config folder. I suggest you delete both ot these files and replace "hardware_config.py" with "comms_config.py" to clarity.