core: enable monaco as a text editor

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

(incomplete backport as we don't have ERP5JS editor gadget yet)

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

@@ -10,4 +10,7 @@ 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