AVPlugin: fit to new avTranscoder API

Rename ColorTransform to VideoEssenceTransform.
AVWriterFactory: get audio and video presets from avTranscoder

Still getting "main presets" and "format presets" from libav.
AVWriter: refactoring

* AVProcessParams: suppress unused array _inputAudioFilePath.
* Update comments.
AVWriterPlugin: set audio preset if specified

Warning: Nothing is set if custom preset is specified (only rewrap the audio stream).
AV Reader & Writer: fit to new avTranscoder API

* Renamed OutputStreamVideo to EssenceStream/OutputVideo.
* Renamed InputStreamVideo to EssenceStream/InputVideo.
AVWriterFactory: move audioDetailledGroup above audioNbStream
AVWriterPlugin: fix when outputFile is not init

Avoid seg fault in endSequenceRender when ouputFile is not init.
AVWriterPlugin: set custom audio preset if specified

Warning: Only the audio codec and the sample format are set.
AVPlugin: fix bad name of OFX params

* Add prefix to Int params.
* Add prefix to childs of Group params.
AVWriter: refactoring

Can load the list of profiles by calling a specific Profile constructor.