Allow to add simulated peripheral while scanning

[lukerayman]

Right now you have to add all the simulated peripherals before calling startPeripheralScan(). If you do it later, it won't show up in scan results. My workaround for this is to stop scan and start it again.

I think it should be possible to add simulated peripherals at any time and BLE Manager should be able to see as they appear while scanning.