added ofxAudioUnitGetParametersExtra methods

method to get non-Apple AU's list of parameters and properties
moved to Params branch
Revert "moved to Params branch"

This reverts commit de1b106105b757f1e64ee738faec1eee461ab094.
Revert "Revert "moved to Params branch""

This reverts commit c63368dff2db59efc009787d1e24cf0449bf270f.
Merge pull request #4 from ruxrux/params

merge some params utils from ruxrux