[Azoth Xoox] Too much confusion with XEP-0090.
[Azoth Xoox] Slightly better code.
[Azoth Xoox] AdHocCommandManager::handleStanza() refactored.
[Azoth Xoox] Added support for Ad-Hoc notes in AdHocResult.
[Azoth Xoox] Parse ad-hoc command notes.
[Azoth Xoox] Hide form area if no forms.
[Azoth Xoox] Show ad-hoc command notes.