Renderer loading priority take 2

@SubJunk here's an alternative loading priority solution, let me know if it works ok for you.  I tested it on home-made higher priority variants of Android (Bubble Upnp, Upnplay) and it picked the right ones.

@SharkHunter this pr proposes to get rid of the ```getRendererConfigurationByUA/ByUAAHH``` stuff so please confirm whether it would impact channels.