Add clarification to AudioAppComponent documentation

The documentation should probably mention it’s not sensible to make multiple classes inherit AudioAppComponent nor have multiple instances of it in an application. Also some people here in the forum have posted attempting to use it within a plugin, so maybe it would be good to also add a note about that not being the best of ideas.

Better yet, maybe the class itself could somehow be enforced to fail if multiple instantiations are attempted.


Will make sure this is added to the documentation and possibly in tutorials. Thanks