Upgrade the tei-editor to 0.7.0

CHANGES.md

editor/jinja2/editor/edit.jinja2

editor/static/editor/css/app.css

editor/static/editor/js/editor/app.js

editor/static/editor/js/editor/app.js.map

editor/static/editor/js/editor/chunk-vendors.js

editor/static/editor/js/editor/chunk-vendors.js.map

editor/static/editor/js/tei-editor.js

gulpfile.js

package.json

theme/_tei-editor.scss

yarn.lock