Enhancements:
-------------

* Provide variant variables for use in selector expressions  #2258

Bug fixes:
----------

* fix ordering of recipe elements in skeletonized pypi recipes  #2230
* Trim empty variant sections (due to selectors) prior to zipping keys  #2258
* Don't set blank env vars in build scripts  #2259
* Fix testing with recipe paths  #2262
* add newlines to test scripts  #2265
* Fix render command not considering provided channels  #2267
* fix get_value being hardcoded to only first entry  #2268
* fix setting target (target platform) in output section causing tarcheck validation error  #2271
* don't add setuptools to runtime dependencies in skeletonized pypi recipes (only build)  #2272