Basic functionality for Arm-Embedded

[ethanholter]

High level goals for the code:

• Receive commands via CAN bus
• Control stepperonline stepper driver

Step by step:

• The logic to control the stepper drivers can be taken almost directly from Rover_Embedded. See @ethanholter when starting this because there is some unintuitive logic happening which will need to be walked through
• The general logic for receiving CAN bus commands should (hopefully) be mostly the same as the Rover_Embedded serial logic. We have never used CAN bus before so some research will be needed
• We want to be mindful of the future as we implement this code. One thing that will become more of a problem later is bandwith along the CAN bus. We want to keep communication as fast as we possibly can because this will result in a more precise and efficient control loop (see me for a more thorough explanation). Instead of receiving commands that look like this: o 1 255\r which is 8 bytes, we instead want to receive a binary message looking like this 10110001 10011010. This is only 2 bytes. again, see me for a more thorough walk through of what this means and why it is important.