- Simplify an example. `useCallback` is not required.
 - Add a comment regarding effect cleanup

Fix an issue where `GroupListItem` components did not re-render when the
focused group changed. This component is due to be replaced shortly, so
this is really just a test case to show that `useStore` works as
expected.

Add a hook that connects a store to a React/Preact component and ensures that
it re-renders when relevant store state changes.

Merge pull request #1141 from hypothesis/dependabot/npm_and_yarn/babel-plugin-transform-async-to-promises-0.8.11

Bump babel-plugin-transform-async-to-promises from 0.8.10 to 0.8.11

This fixes a code generation bug which broke the latest version of
babel-plugin-transform-async-to-promises.

Bump @octokit/rest from 16.26.0 to 16.27.0

Bump raven-js from 3.27.0 to 3.27.1

Bump express from 4.17.0 to 4.17.1

Bump @babel/core from 7.4.4 to 7.4.5

Bumps [babel-plugin-transform-async-to-promises](https://github.com/rpetrich/babel-plugin-transform-async-to-promises) from 0.8.10 to 0.8.11.
- [Release notes](https://github.com/rpetrich/babel-plugin-transform-async-to-promises/releases)
- [Commits](https://github.com/rpetrich/babel-plugin-transform-async-to-promises/compare/v0.8.10...v0.8.11)

Bump @babel/preset-env from 7.4.4 to 7.4.5

Bump core-js from 2.6.6 to 2.6.9

Bumps [express](https://github.com/expressjs/express) from 4.17.0 to 4.17.1.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.17.0...4.17.1)

Bumps [raven-js](https://github.com/getsentry/raven-js) from 3.27.0 to 3.27.1.
- [Release notes](https://github.com/getsentry/raven-js/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/raven-js/commits)

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 16.26.0 to 16.27.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v16.26.0...v16.27.0)

Bumps [@babel/core](https://github.com/babel/babel) from 7.4.4 to 7.4.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.4.4...v7.4.5)

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.4.4 to 7.4.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.4.4...v7.4.5)

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.6 to 2.6.9.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.6.6...v2.6.9)

[Security] Bump tar from 2.2.1 to 2.2.2

Bumps [tar](https://github.com/npm/node-tar) from 2.2.1 to 2.2.2. **This update includes security fixes.**
- [Release notes](https://github.com/npm/node-tar/releases)
- [Commits](https://github.com/npm/node-tar/compare/v2.2.1...v2.2.2)

Format gulpfile.js and files in scripts/ using Prettier

Eliminate an inconsistency in the client codebase that most files are
formatted with Prettier but files in scripts/ and gulpfile.js were not.

Show focus indicator on various UI elements if they have keyboard focus

Bump express from 4.16.4 to 4.17.0

Bump prettier from 1.17.0 to 1.17.1

Bump @octokit/rest from 16.25.4 to 16.26.0

Bump codecov from 3.4.0 to 3.5.0

Bump core-js from 2.6.5 to 2.6.6

Bumps [prettier](https://github.com/prettier/prettier) from 1.17.0 to 1.17.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/1.17.0...1.17.1)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [express](https://github.com/expressjs/express) from 4.16.4 to 4.17.0.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](https://github.com/expressjs/express/compare/4.16.4...4.17.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 16.25.4 to 16.26.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v16.25.4...v16.26.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.5 to 2.6.6.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/compare/v2.6.5...v2.6.6)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [codecov](https://github.com/codecov/codecov-node) from 3.4.0 to 3.5.0.
- [Release notes](https://github.com/codecov/codecov-node/releases)
- [Commits](https://github.com/codecov/codecov-node/commits)
Signed-off-by: dependabot[bot] <support@dependabot.com>

Enable a focus indicator for top bar buttons and the selected tab when
using keyboard input

The :focus-visible pseudo-class [1] enables showing or suppressing focus
outlines depending on the input modality, eg. hiding focus outlines by
default but enabling them if the user is using a keyboard or otherwise
indicates to their browser that they need a focus indicator.

It is not widely available natively yet though. Add the "official" JS
polyfill for it and a mixin that uses it to suppress an element's
outline when the user agent deems it is not required (typically when
using mouse input).

[1] https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible

Implement new menu component and add icons for it

Incorporate build fix from https://github.com/hypothesis/client/pull/1127

Adjust the vertical offset of the content to match our previous dropdown
menus, which looked better.

This provides more flexibility as it can be used to set color as well as
size and it is also more consistent with how everything else is styled in the
application.

Replace the existing use of the `size` prop and tweak menu item icon
sizes.