Template Provider Improvements

We have improved the template provider edit form:

• Both the creation and the visibility restrictions are now using a location picker. When you click on the "+" icon a popup appears with the page tree from where you can select one or multiple locations.
• The icon field is now using an icon picker.
• We rearranged the fields in order to better fill the available space. The left column contains visibility / display options, while the right column contains creation options.
• We added more hints and improved some of the field labels.

See the Template Provider documentation for more information.