CONTENTBOX-549 #resolve #close
EditorService new methods: hasEditor() and hasMarkup, to validate if editors and markups exist
CONTENTBOX-550 #resolve #close
If a user set's an editor preference and the editor does not exist, exception is thrown

CONTENTBOX-541 #resolve
Content store items can now have hierarchy
Merge branch 'feature/CONTENTBOX-541-Hierarchy-ContentStore' into development
CONTENTBOX-551 #resolve #close
Add Create new Content store to global creation menu