bluez dependency checking

[lea255ace]

Building on a system without libbluetooth-dev or bluez-tools will pass cmake but choke in the build. This should be added as a fatal dependency check for cmake.

[Jack-Byrne]

Strange. Referenced PR says it was merged into Master yet we can't find the FindBluetooth Cmake module anywhere or the commit that added it.

Leaving open to re-add the find bluetooth cmake module.

[LitvinenkoIra]

Priority Low. Defect is related to environment.

[iCollin]

I was able to reproduce by removing libbluetooth-dev but not by removing bluez-tools