fixes#4596
* Prevent possible undefined behaviour by get methods not taking an index as parameter
* Add methods to get the count of service data UUIDs and service UUIDs
* Various code improvements
* improve & fix BLEScan when too many BLE devices
- when wantDuplicates, no need to check duplicate and no more insert into vector
- delete advertisedDevice when not insert into vector, fix memory leak
- add showParse when you just want raw advertised data
