ICodec: manage case with codecId 0

* Print warning, and not allocate AVCodec.
* Same idea in ffprobe: warn the user of the unsupported codec, but
allow him to manage other streams of the input file.
AvInputAudio: clean

* Remove comments.
* Add @todo.
* Symmetry with readNextFrame with a subStreamIndex: use variables to
get "src" and "dst" when copy samples.
App genericProcessor: set verbose to false by default

By default, a user doesn't want all printed on console.
Option: fix setters throw runtime_error

* These functions threw a runtime_error with error named "SUCCESS".
* No visible consequences because we caught them when setProfile...