921bdd4a51d53af26e28548641ff461080390da7
Remove old code to remove duplicate engine state which was used to work-around a bug since 3.x saved duplicates but broke with 4.x separate i/o devices. Add a new variant to purge old unused states per backend (after sorting).
When building with MSVC make sure any backends / panners etc get copied to the correct target folder
Please see the Ardour web site at http://ardour.org/ for all documentation..
For information on building ardour:
http://ardour.org/development.html
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