Full calibration clarification

[jversloot]

Clarification around the language for full calibration: it means to hold the joystick in those positions, not moving the cursor to those positions.

Additionally, add a confirmation page before completing full calibration because incorrect full calibration causes more issues. Could also add error handling here if the values for the 4 corners are under a certain threshold, ignore them and add a message on screen.

This should all be clarified in the documentation as well.