Initial working Java binding for the direct_bt C++ module

Example ScannerTinyB01 demonstrates efficient scanning devices using the new BluetoothDeviceDiscoveryListener interface.

The C++ HCIObject extends JavaUplink, which handles the java object references
via 'std::shared_ptr<JavaAnonObj>', where JavaAnonObj relies on later polymorph specialization.

JavaAnonObj gets derived in the java/jni of direct_bt, where the JNI header + libraries are available.

+++

The java inplementing NativeDownlink implementations
store the nativeInstance to the C++ instances
as well as handle their java references within the native instances.

The C++ JavaUplink and Java NativeDownlink interfaces are complete
the cross referencing java <-> native.

+++

Native libraries are now split into pairs:
- tinyb + javatinyb
- direct_bt + javadirect_bt

TODO: BluetoothFactory must chose the proper bundle!

+++

The Java Adapter received a BluetoothDeviceDiscoveryListener hook,
matching C++ Adapter's HCIDeviceDiscoveryListener.

Since the Java Adapter implements its own discovery thread,
using the BluetoothDeviceDiscoveryListener is more efficient then polling
over a list of Devices fetched.

++++

TODO: Align Java and C++ class names, foremost in the C++ direct_bt space.

TODO: Bind the whole C++ GATT functionality

More testing.

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