Only leftward resizing is allowed since there's no space for boxes to expand on the right.
Text area of chat boxes don't yet resize properly.
Didn't test at all on chat rooms.
Instead of differentiating between trimmed chats and minimized chats, the two
are now combined into the same thing.
This commit contains some initial work, but functionality is still impaired.
- disable drag resizing when chatboxes are minimized.
- refactored chat box and chat room markup so that they are more similar.
- don't make the chat box title clickable if no vcard URL is available
- make only the title text clickable, not the whitespace
- fixed toggling of resized chats