Release Notes - opentap 9.23.0 
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New Features 
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- Use PluginTypeSelectorAttribute for Mixin selector [#1349](https://github.com/opentap/opentap/issues/1349)
- Add MacOS to nuget package [#1353](https://github.com/opentap/opentap/issues/1353)
- Make IMixinBuilder an ITapPlugin [#1392](https://github.com/opentap/opentap/issues/1392)

Bug Fixes 
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- Mixin properties are not updated after modifying it via "Modfiy Mixin" menu item. [#1372](https://github.com/opentap/opentap/issues/1372)
- Incorrect file reference [#1370](https://github.com/opentap/opentap/issues/1370)
- Package Create: Plugins that are not added from dotnet dlls are not added to File elements [#1336](https://github.com/opentap/opentap/issues/1336)