Todo list

The master todo list. When you notice tasks that should be done eventually, add them here. We can split this list up if it gets too long.

• Figure out whether the absolute position of the encoder is drifting. Every loop, if the index position (channel Z value) has changed, print out the REG_TC0_CV1 value. This should be equal to x_offset, as calculated during front wheel calibration. If it isn't, then the absolute position of the encoder is drifting, which needs to be fixed. If not, we're fine.
• Add the cylindrical shell back to the front motor column to reduce stress on the screws