Closes T2322

When browsing a content or a directory in a snapshot context, add a box on top
of the views content giving info about current tip revision: link, author, date
and first message line.

Closes T2326

That feature is only useful for large screens so hide the full width
switch on screens where width is lesser than 992px.

Closes T2461

Keep a single test using the UI to login and add a Cypress command to login
programatically because UI login is slow, cumbersome, and unnecessary.

https://docs.cypress.io/guides/getting-started/testing-your-app.html#Logging-in

Remove the Actions dropdown and replace with simple buttons instead: "Download",
"New snapshot" and "Show metadata".

Hide the "Download as git" and "Show metadata" action for non staff users.

Related to T2326

Closes T2448

Related to T2310

Related to D3314

Use tabs to navigate between code views, branches list view, releases list view
and origin visits view.

Simplify title in top navbar and move origin links to page main content.

Related to T2326

If a Django user has the "swh.web.api.throttling_exempted" permission, he
will not be rate limited.

Related to T1927

Keycloak user permissions are named Roles in Keycloak semantics.

Extract them from each decoded access token and override methods from
django.contrib.auth.models.PermissionsMixin in order to manipulate them
as Django user permissions.

Closes T2247

This prevents weird top navigation elements layout on high resolution screens.

Closes T2456

Add a switch in the top left part of the UI in order to toggle full width
rendering of web application content.

This can be useful for high resolution screens or to extend the viewport width
for source code rendering.

The full width rendering state is also saved in browser local storage in order
to restore it on each web application page load.

Closes T2456

Clarify the order in which revisions are returned (BFS) in documentation.

Stop returning next-link in response headers as it is not sufficient to properly
resume the BFS traversal on the revision graph.

Remove any references to pagination in documentation and rename per_page query
parameter to limit (also set its max value to 1000).

Add warning in documentation explaining how a client can obtain the full BFS
traversal of the revision graph.

Remove useless optional prev_sha1s URL argument.

Closes T2450

Add a top border of 3px colored with the SWH theme red for nicer display

- Remove huge Web API links and put a smaller instead at the bottom right
  of the search box

- Remove redundant links

- Set gray background to search interface

- Simplify sidebar menu

Closes T2317

Related to T2317

Set Bootstrap primary color to SWH theme red color and use Bootstrap custom
checboxes and radio buttons in order to get a nicer display of UI elements.

Closes T2318

Related to T2310

Migrate swh-web icons (Font Awesome ones, octicon commit, png images) to their
Material Design Icons counterparts in order to get a consistent icons style.

Material Design Icons is an open source and exhaustive icons collection
allowing designers and developers targeting various platforms to download icons
in the format, color and size they need for any project.

Closes T2445

Instead of origin_visit_update endpoint.

Related to T2310

Make the save request form always visible by moving it from the "Create
save request" tab to the top of the page.

Rename "Create save request" tab to "Help".

Make all html alerts closable.

Closes T2324

Make the main link in each row targets the origin copy in the archive
if it has been successfully loaded.

Add a link to each origin through an external link icon.

Closes T2405

A release is looked up by its name and not its branch name in a snapshot.
For git origins, the branch name differs from the release name:
"/refs/tags/(release_name)".

So lookup for that type of branch name first and add fallback for release
name for other origin types.

Closes T2437

When a directory is browsed in an origin or snapshot context, some SWHIDs to
display were missing: revision, release and snapshot.

Closes T2437

When a content is browsed in an origin or snapshot context, some SWHIDs to
display were missing: directory, revision, release and snapshot.

Related to T2437

Ensure day popovers will be disposed when the mouse pointer leaves the
day on calendar or leaves the popover.

Closes T2426

Update the built browse urls from new SWHID contextual info:

  * visit : the snapshot in which the object has been found

  * anchor: an ancestor of the object in the SWH graph defining browsing scope

  * path: path of the object from its root directory

Closes T2342
Closes T2408

Closes T2427

Closes T2417

It enables to browse archived objects scoped to a given origin visit, possibly
on a given branch, release or revision.

Related to T2342
Related to T2427

Closes T2359

Use tuples instead of lists when instantiating and manipulating models.

Prior to this commit, empty exclusion pattern would exclude everything.