Add argument to allow the user to set what level of results to retrieve

[rebeccaRossRobotics]

Through trying to implement arduino library with a VL53L1X carrier board I found that with the device results level set to full would result in an error code of -13, but reducing it to system or core allowed it to work.

I have made a PR which modifies the functions that set the VL53L1_DeviceResultsLevel variable so that this is user configurable when calling the function. #11