Save calibration values in browser

[Ezward]

We currently have to re-input our motor and speed control calibration values each time the rover is started. It would be better to save these in the browser and reload them when the application is started.

• When we save calibration values to the rover, also save them in the browser.

This has a forward looking benefit; if we implement a simulator in the browser then it will also have access to saved calibration values.