Port 8389b496ba to glitch flavour

The modal-handling code gives back focus to the element focused when the
modal opened. However, in the case of reply confirmation, it would do so
*after* the composer code itself requested focus.

Port 5bf100f87b to glitch-soc

Port 90b64c0069 to glitch-soc

Fixes #819

Partially port 90b64c0069

Port dd00cd19d2 to glitch-soc

Port 795f0107d2 to glitch-soc

Port 7861c5f108 to glitch-soc

Media modals push an history state so that pressing back on mobile closes them.
We made sure to not scroll when opening them, but not when *closing* them,
which caused some issues in rare cases.

Port f7a6f9489d to glitch-soc

[API] [vanilla required] [glitch-soc optional] initial_state show_sensitive_media boolean changed to show_media string with options "default", "hide_all", "show_all"

If the current logged-in user is an admin, add quick links to the admin
interface in account and toot dropdown menu. Suggestion by @ashkitten

Fixes #700

Port 248df68c36 to glitch-soc

Port 885711afb9 to glitch-soc

Port 66dbb59aa1 to glitch-soc

Fixes #678

Port 025fbb8285 to glitch-soc

Port 2bbec9f4da to glitch-soc

Port ac092d03e7 to glitch-soc

Port dcd3544d15 to glitch-soc

Defaults to false.

Port 4df9cabb22 to glitch-soc

Port Mastodon's hashtag stats thing to glitch-soc.
This doesn't change how hashtags are ordered, and doesn't add a trending
hashtags section, but it does change how hashtag searches are rendered,
displaying a trend line alongside each hashtag.

Ctrl+click usually allows opening a link in a new tab. This
was prevented for hashtag or user links in toots.

Port e0b1e17bd0 to glitch-soc

Port bb71538bb5 to glitch-soc

Change inspired by 691107263c

Port cdb101340a to glitch-soc,
but without dropping support for regexp filters yet.