Add a binder based server implementation

Add the rough outlines of the client library.  The binder based server
is not implmented by the webservd side of the interface, in addition to
being non-functional in pretty much every other way.

Bug: 26385135
Test: test client and libwebservd compile, sanity integration test
      continues to pass

Change-Id: I036b97128e18033ead36e0af135a5a1729bacb3d
11 files changed