Fix internal types for PID

[gbip]

We have calculated the uncertainty in the precision of the robot and have settled for some units to be used in the PID calculation.

• Distance : 10th of a millimeter
• Angles : 10th of a millirad

We need to create those types and implements common methods for it. We should use the derive_more crate for deriving common traits for these types but it does not yet support no-std (see this issue).