New BluetoothSocket API.

Modeled on blocking java.net.Socket and java.net.ServerSocket library.

Public interface is:

public final class BluetoothSocket implements Closeable {
   public static BluetoothSocket createRfcommSocket(String address, int port) throws IOException;
   public static BluetoothSocket createInsecureRfcommSocket(String address, int port) throws IOException;

   public void connect() throws IOException;
   public void close() throws IOException;

   public String getAddress();
   public InputStream getInputStream() throws IOException;
   public OutputStream getOutputStream() throws IOException;
}

public final class BluetoothServerSocket implements Closeable {
   public static BluetoothServerSocket listenUsingRfcommOn(int port) throws IOException;
   public static BluetoothServerSocket listenUsingUnsecureRfcommOn(int port) throws IOException;

   public BluetoothSocket accept() throws IOException;
   public BluetoothSocket accept(int timeout) throws IOException;
   public void close() throws IOException;

}