Threads feature parity

[rafalp]

This is a checklist of features that Misago's threads currently implement that new pages should also implement. Already implemented or WIP features with progress tracked on their PRs are removed from the list to make it less terrifying to look at.

Richtext

• Break long words

Posts

• Hidden post with visible contents
• Hidden post without visible contents

Misc

• Get post's permalink
• Metatags
• Page header
• Breadcrumbs
• Post preview on post likes/history page.

[rafalp]

I've started breaking up this massive list of things to do into sections for bigger clarity.