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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`!

Port 4f42238c29 to glitch-soc

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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.

Port 8182b61518 to glitch-soc

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It should not be necessary thanks to our Content Security Policy, but best
be sure in case a server's CSP is incorrect. Also, avoids a CSP warning about
loading remote scripts.

* Make sure loading indicator has enough vertical space
* Respect reduce_motion setting for loading indicator

Port 4ede51743e to glitch-soc

Fixes #855

Port part of 7c48688d85 to glitch-soc

Display “load more” more consistently, add a loading indicator on first load.

(Even though that codepath is probably never actually used…)

Port e18390cfe6 to glitch-soc

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Port 023fe5181b to glitch-soc

- Move componentWillMount and componentWillReceiveProps logic to
  getDerivedStateFromProps.
- Compute CW auto-unfold status earlier

Fixes #832

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