added ability to use multiple VL53L0X on the same I2C bus

[2bndy5]

• added set_address() to the VL53L0X class. This function follows the Arduino library API meaning the new address is internally saved appropriately.
• included "important" admonished note about managing the "SHDN" pin as that falls outside the scope of the class/library
• added an example of how to use the new set_address() function in concert with the "SHDN" pin. Also included a link in the API docs to this example. Additionally, I've made the example easily modify-able for applications with more than 2 VL53L0X sensors. Comments also hint at current consumption requirements.

Question

I've hinted at the different labeling on non-Adafruit branded breakout boards ("SHDN" on adafruit breakouts = "XSHUT" on non-Adafruit breakouts). I don't want to overstep, and since the library is maintained by Adafruit, is it ok to mention non-Adafruit branded labeling?

[jepler]

This matches what the Arduino code is doing, as far as I can tell. The chance of impact on other users is low, given that this passes lint and introduces a whole new function rather than modifying anything existing. I did not test actual hardware.

[FoamyGuy]

I've got a few of the VL53L0X sensors on the way. I will test these changes with multiple sensors once they arrive.

[2bndy5]

@FoamyGuy Are they Adafruit branded breakouts or generic? I tested this with 2 generic sensors using the new "multiple_sensors" example script that I added, and it worked fine. I do welcome confirmation though :)

[FoamyGuy]

@2bndy5 They are Adafruit breakout boards. I will get this tested over the weekend.

[FoamyGuy]

@kattni @jepler This tested successfully with a Trinket M0 and 2 VL53L0X. I am able to see distance measurements from both sensors. @2bndy5 Thank you for including this and making a PR!

[2bndy5]

Yeah!

[kattni]

Excellent! Thank you @2bndy5 and @FoamyGuy!