* [breaking] Refactor the BLE devices identification
generalize the use of the mac address with : for the lists, white, black and internal identification
Move structures from config_BT.h to ZgatewayBT.ino
update doc
* Move minRssi to INO and optimizations
change Minrssi name to match other variable convention
Optimize the add of : to mac address
Reduce the use of abs()
Note: I cannot move BLEinterval to the ZgatewayBT.ino due to its use on main.ino