so that `hidden` class gets applied to the right element

- Filter did the opposite of what it was supposed to do
- Wrong bind context
- Should actually be mam:2, issue was server misconfiguration

if the fullname is not available.

This allows us to cache them for longer.

- set `username` on the message object,
  instead of always using `fullname` with fallback to `jid`.
- Distinguish better between `groupchat` messages and normal
  messages in `getMessageAttributesFromStanza`

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By overriding the `set` method.

Use break-word in long URLs but not otherwise.

due to asynchronous events.

Part of slowly trying to bring all styles into a single CSS file.

Also, add urijs to more intelligently handle URIs

- Render images as thumbnails
- Use the image.html template when rendering images from pasted URLs
- Update message and spoiler markup to render avatars
- Use the default avatar as fallback when user doesn't have one
- Instead of 'me' render own name or JID