Issue 3599: Add snippets_enabled flag to projects for API

Created by: dblessing

Fixes #3599 (closed).

I have tested this for both creation and retrieval via API and it all works as described. I applied these changes and tested on a master branch build.

Please see previous pull request at #3989 for discussion regarding the comments. I had some issues with the squash and ended up having to close that PR in favor of this one. Thanks.