CustomLv2Host: refactoring

Update indent: from two spaces to tab with indent size egal to four.
CustomLv2SearchPlugin: refactoring
CustomLv2Host: add getters for Node class

* getNbAudioInput()
* getNbAudioOutput()
* Refactoring: delete useless spaces...
CustomLv2Host: the output file is a AIFF

Write a AIFF file instead of WAV.