* Merge
* Clean up
* More clean up
* Ensure image import works when type is not set, clean up post import actions
* Removed spurious new line
* For non image files insert a tiddler link
* Added documentation for new settings and features
* Extend dropzone widget with optional actions invoked after tm-import-tiddlers message has been sent. Allows triggering an alternative UX for the import
* Allow restricting a dropzone to specific mimeTypes via mimeTypes and mimeTypesPrefix attributes
* Use a mimeTypesFilter instead of the mimeTypes and mimeTypesPrefix attributes
* Updated refresh handling
* Syntax cleanup
* Replace references to mimeType with content type for consistency with existing documentation. Update documentation for DropZone widget
