Restructure Bluetooth part of sl4a.

Spliting Rfcomm out of BluetoothFacade.java
Merging BluetoothFacade project into Common.
This will shorten build time and reduce project complexity.
Add A2DP and HSP profile.
Add a facade on bluetooth profile connection/pairing.
Various improvements in Bluetooth code.

Change-Id: Ibb086910ca85050d191baba4abd8733c3d0c27e7
16 files changed