This change adds a new dropdown trigger next to the "New Topic" button.
When clicked a menu will display a list of topic/post drafts that can be
clicked to resume the draft within the composer.
The "New Topic" button will no longer change text to show "Open Draft"
when a draft topic exists, it will still attempt to load the existing
draft if one exists (this will change later when we support multiple
drafts in a separate PR).
The "My Posts" link in desktop sidebar will now be "My Drafts" and only
appear when the current user has existing drafts.
This commit will now change two behaviors:
- If composer is already opened on a specific post and we click on edit again for the same post, we will do nothing and not show the discard draft modal
- if composer is shrinked and we click on edit for the same currently edited post, we will just open the composer and not show the discard draft modal
