create extended POST

[markmellors]

more in depth checks to test functionality

• [ ] motors start moving at acceptable power level in both directions
• [ ] motor top speed in both directions is acceptable
• [ ] check steering achieves max range of motion
• [ ] check IMU calibration - check 8 different headings?
• [ ] TOF give correct readings - long and short range targets

[robberwick]

Marking as blocked until we know what's happening with the on board display