Separated Change Lead creator feature into a plugin.
New hook to filter possible creators (users)
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Merge pull request #5 from katzwebservices/separate-lead-creator

* Separated Change Lead creator feature into a separate, packaged plugin. This will allow you to enable or disable the functionality.
* Added a new filter (`kws_gf_entry_creator_users`) for the Entry  to be able to specify what users appear in the dropdown (as an array of `WP_User` objects). If no users are specified,