Port 9ee9cb549b to glitch-soc

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Port JS changes from 4fb94c758e to glitch-soc

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Port SCSS changes from 1c6588accc

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glitch-soc's public.js was a bit out of date, and code was put inappropriately
to the common public.js

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Port 2ee779dcd3 to glitch-soc

Fixes #875

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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.

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This introduces new requirements in the API:

  `/api/v1/timelines/tag/:tag` now accepts new params: `any`, `all` and `none`
  It now returns status matching tag :tag or any of the :any, provided that
  they also include all tags in `all` and none of `none`.

Port relevant parts of 9d4541c612 to glitch-soc

WARNING: This may break some custom skins!

  `.drawer > .contents` has been moved to
  `.drawer > .drawer__pager > .drawer__iner`, and the waves have been moved
  from `.drawer > .contents` to `.drawer__inner__mastodon`!

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This is both for consistency with account timelines and to not mess with
the logic used to decide whether going back in the browser's history is
going to make us leave the WebUI.

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