utils: Adds the create bin method there to be used internally.
test sources: Modifies the way we handle properties such as pattern.

     + This makes make check pass.
     + This standardizes property handling.
sources: Starts adding video-uri-source et al. WIP fix up on me.
Removes old uri-source
Documentation updates.
Implement audio and video source.
Port all sources to inheriting from audio / video base sources.

That was painful.