Rewrite: Message Attachments

KNOWN_ISSUES.md

@@ -0,0 +1,6 @@
+## `registerFieldTemplate` is deprecated
+    hmm it's true :(, we don't encourage this type of customization anymore, it ends up opening some security holes, we prefer the use of UIKit. If you feel any difficulty let us know
+## `attachment.actions` is deprecated
+    same reason above
+## `attachment PDF preview` is no longer being rendered
+    it is temporarily disabled, nowadays is huge effort render the previews and requires the download of the entire file on the client. We are working to improve this :)

app/message-attachments/client/index.js

@@ -1,6 +1 @@
-import './messageAttachment.html';
-import './messageAttachment';
-import './renderField.html';
-import './stylesheets/messageAttachments.css';
-
 export { registerFieldTemplate } from './renderField';