Implement multi-robot configuration

[Dylan-Powers]

As a robotics team member, I want to be able to specify what ports different subsystems are on and reverse motors without touching code so that we can maintain a single codebase for all robots and so that everyone can adjust which motors are on which ports.

Definition of Done:

• A single file on the SD card can configure any port to map to any motor of a standard subsystem configuration.
• Any motor can be reversed from that file.

Note: a "standard subsystem configuration" can be thought of as a standard drive base plus some subsystem motors. The specific game and robot progress can determine what exactly this looks like.