Clean up Bluetooth Manager API so it can be shared between multiple clients

[vkolotov]

There are some setter methods on the BluetoothManager interface that changes state of the manager. These methods should be removed from the public API. Most likely a good solutions for this would be a new "builder" class that creates and sets up bluetooth manager instances.

[vkolotov]

Re-opening this issue as there are more possibilities for improvements:
- Improving bluetooth manager builder
- tweaking bluetooth manager to be able to work with procedural approach (without listeners)
- tweaking responsiveness of the governors control methods