Fix possible UR, clear compile warnings, add printPalErrorString() wrapper

[felix-kolbe]

I improved the library regarding following points:

• Fix a possible undefined read error in VL53L0X_CheckAndLoadInterruptSettings().
• Clean library from compiler warnings by removing unused variables.
• Add Adafruit_VL53L0X::printPalErrorString() to human-readably print the status code returned e.g. by Adafruit_VL53L0X::getSingleRangingMeasurement().

Thanks for maintaining and merging :-)

[caternuson]

@felix-kolbe Hey, sorry this never got looked at. If you're still interested in submitting this PR, please update to resolve the merge conflicts.

[felix-kolbe]

@caternuson Happy New Year ;-) I found the mail for your comment again and gave it a try.
As you can imagine I don't have the hardware setup anymore (not even back in 2022), so this is just a rebase with a style updates, basically. Nice to see this Arduino Library CI, though!