Diacritic Plugin for Annotator TooL: Added CSS and JS files

- UI Fixes for Diacritic Mark Plugin
Diacritic Plugin for Annotator Tool: Added studio input
Diacritic Plugin for Annotator Tool: Pull-request Fixes

Making sure extension comes after annotator css
Merge pull request #3480 from lduarte1991/lduarte-harvardx2

Annotation Tool Clean up and Plugins