core: enable monaco as a text editor

So that we can edit web pages & web scripts with monaco

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Preference_getAvailableTextEditorList.py

@@ -6,4 +6,7 @@ if getattr(context.portal_skins, "erp5_ace_editor", None) is not None:
 if getattr(context.portal_skins, "erp5_code_mirror", None) is not None:
   text_editor_list.append(("Code Mirror", "codemirror"))
 
+if getattr(context.portal_skins, "erp5_monaco_editor", None) is not None:
+  text_editor_list.append(("Monaco Editor", "monaco"))
+
 return text_editor_list

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/gadget_editor.js.js

@@ -7,6 +7,7 @@ lockGadgetInQueue, unlockGadgetInQueue, unlockGadgetInFailedQueue*/
 
   var editor_dict = {
     "codemirror": {"url": "codemirror.gadget.html"},
+    "monaco": {"url": "monaco-editor.gadget.html"},
     "onlyoffice": {"url": "onlyoffice.gadget.html"},
     "fck_editor": {"url": "ckeditor.gadget.html"},
     "svg_editor" : {"url": "method-draw/method-draw.gadget.html"},