No option to calibrate touch data

[cskwrd]

There is no function to calibrate touch data coming from the screen.

The CircuitPython lib does this when creating the touchscreen.
https://github.com/adafruit/Adafruit_CircuitPython_Touchscreen/blob/baaef855b2f4cb4e7f7d961c65b09c0000413fd8/adafruit_touchscreen.py#L126

[deloverov]

Confirm the problem, calibration would be useful