Input data validation during touchscreen calibration

[prasimix]

Currently, screen calibration data for three points are validated at the end of the calibration. We have to do that during the calibration process and inform user if data is not as expected (out of range or even equal that can be caused by some problem in communication with touchscreen controller).

A warning message can be displayed for few seconds on the screen if such thing is happened like: "Received data is invalid due to imprecise pointing or communication problem"

[prasimix]

Fixed