v3.1.7
Add 'extensions/Widgets/smarty/' from commit '50394b608acf4ab3fe0634761252bd9baa9400fb'

git-subtree-dir: extensions/Widgets/smarty
git-subtree-mainline: e4df688bc37dc3cfce06538758b2684bfab7fed0
git-subtree-split: 50394b608acf4ab3fe0634761252bd9baa9400fb
Template navigation auto expander

Enabling the ability to build navigation templates that are
automatically expanded based on data attributes