Fix target dependency

Change-Id: I90f8c43991e25cb288a97df423794f116e661d5d
Add macros to ease checking of multi-byte bit-strings

Change-Id: I19e3e1ab9b5e21fbd140c67a4a3f9553da9f3066
Provide support for GValues that holds GstBuffers

Change-Id: Ieb58741715761279fbdd339be8d5978a48db64f2
Improve error management for unsupported types

Change-Id: I73461b713644bc799afdfeae40d20b32347e9628