Started attachment drag/drop

Currently fighting between sortable and tinymce mechanisms which prevent
this working due to the different events stopping the drop event while
needing the dragover for cursor placement.

resources/js/components/wysiwyg-editor.js

@@ -639,6 +639,7 @@ class WysiwygEditor {
                 });
 
                 editor.on('drop', function (event) {
+                    console.log('drop')
                     let dom = editor.dom,
                         rng = tinymce.dom.RangeUtils.getCaretRangeFromPoint(event.clientX, event.clientY, editor.getDoc());