[openstreetmap/openstreetmap-website] Rewrite history page url when scrolling (PR #5826)

[Anton Khorev]

The goal here is when viewing history to be able to go back to roughly the same place after visiting a changeset page. It works like this:
- when the changeset list is scrolled down and some item leaves the viewport, the current page location gets changed to include a `before=:changeset_id` parameter, `:changeset_id` being the id of the changeset that left the viewport
- when the changeset list is scrolled up, same thing happens with `after=:changeset_id`
- when the history page is visited and its url includes a `before` parameter, the sidebar is scrolled so the first item is at the top of the viewport
- when the history page is visited and its url includes an `after` parameter, the sidebar is scrolled so the last item is at the bottom of the viewport

With these changes you can open a history page, scroll and load more if necessary, click on a changeset, then click back and arrive at a view that includes roughly the same changesets.

Fixes #647. Also fixes the main issue from #1089 which is the same as #647.

Kind of fixes #933. Clicking *Load more* won't rewrite the url, but scrolling will. *Load more* is actually a link but it doesn't do the expected thing when used as a link, that's to be fixed later.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5826

-- Commit Summary --

  * Rewrite history page url when scrolling
  * Scroll to first/last changeset in history list if before/after param is given
  * Rename changeset loader functions
  * Remove params from url when viewing place history and map is moved

-- File Changes --

    M app/assets/javascripts/index/history.js (91)
    M test/system/history_test.rb (24)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5826.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5826.diff

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