Diacritic Plugin for Annotator TooL: Added CSS and JS files

common/static/css/vendor/ova/diacritic-annotator.css

common/static/css/vendor/ova/edx-annotator.css

common/static/css/vendor/ova/richText-annotator.css

common/static/css/vendor/ova/tags-annotator.css

common/static/js/vendor/ova/diacritic-annotator.js

common/static/js/vendor/ova/flagging-annotator.js

common/static/js/vendor/ova/ova.js

common/static/js/vendor/ova/rangeslider.js

common/static/js/vendor/ova/reply-annotator.js

common/static/js/vendor/ova/richText-annotator.js

common/static/js/vendor/ova/share-annotator.js

common/static/js/vendor/ova/tags-annotator.js

lms/envs/common.py