AnnotationOmega: Add “Saving…” message

Re-implement “Saving…” message from legacy `Annotation` template

Fixes #1836

Make shortcut keys available with `metaKey` as well as `ctrlKey`

Update keypress handling to recognize `CMD/META+key` as well as
`CTRL+key`. Very nice for the Mac users.

Change highlight announcement text to "annotation start"

Add reply and collapsed classnames to `AnnotationOmega`

Move last remaining module out of src/sidebar/directive/test

Bump fetch-mock from 8.3.2 to 9.0.0

Bump terser from 4.6.3 to 4.6.4

Bump preact from 10.3.2 to 10.3.3

Bump @sentry/browser from 5.12.4 to 5.13.0

Bump sass from 1.25.0 to 1.26.2

Bump mocha from 7.0.1 to 7.1.0

Mirror the current implementation in `Annotation` and `AnnotationThread`
for applying stateful CSS classes to `AnnotationOmega` elements. This
approach should be reviewed after migration is complete.

Fixes #1837

Bumps [@babel/core](https://github.com/babel/babel) from 7.8.4 to 7.8.6.
- [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/v7.8.4...v7.8.6)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.8.4 to 7.8.6.
- [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/v7.8.4...v7.8.6)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [mocha](https://github.com/mochajs/mocha) from 7.0.1 to 7.1.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v7.0.1...v7.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint-plugin-react-hooks](https://github.com/facebook/react/tree/HEAD/packages/eslint-plugin-react-hooks) from 2.4.0 to 2.5.0.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/HEAD/packages/eslint-plugin-react-hooks)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.624.0 to 2.630.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.624.0...v2.630.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sass](https://github.com/sass/dart-sass) from 1.25.0 to 1.26.2.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.25.0...1.26.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 5.12.4 to 5.13.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/5.12.4...5.13.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [preact](https://github.com/preactjs/preact) from 10.3.2 to 10.3.3.
- [Release notes](https://github.com/preactjs/preact/releases)
- [Commits](https://github.com/preactjs/preact/compare/10.3.2...10.3.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [terser](https://github.com/terser/terser) from 4.6.3 to 4.6.4.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v4.6.3...v4.6.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [fetch-mock](https://github.com/wheresrhys/fetch-mock) from 8.3.2 to 9.0.0.
- [Release notes](https://github.com/wheresrhys/fetch-mock/releases)
- [Commits](https://github.com/wheresrhys/fetch-mock/compare/v8.3.2...v9.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fixes #1817

Add save-with-key-combo support to `AnnotationOmega`

Fix page note initial tab selection when there are replies in the mix

Move Angular component testing utilities into
src/sidebar/components/test and rename the module to make it clear that
it contains Angular-specific code which we can delete once all
components are converted.

Remove non-functional `window-scroll` Angular directive

The /stream view is supposed to automatically fetch new annotations as
you scroll. However this has been broken for a very long time. The
code responsible for making this happen relied on `scroll` events on the `window`.
However the stream content has for a long time been contained in a scrollable
`.app-content-wrapper` container, so no such events were emitted.

For the moment, just remove the non-functional code as that gets us a
step closer to completing the migration away from Angular.

Remove h-branding Angular directive

After the previous commit, this is no longer used in the app.

Fix top bar failing to display in /stream route

Remove unused Angular filters and directives

Before, the page notes tab would not be selected if any of the page
notes had replies. Now will correctly auto-select page notes tab if
all top-level (i.e. non-reply) annotations are page notes.

Also add some rudimentary tests for the `ADD_ANNOTATIONS` reducer in
the `selection` store module as none existed.

Fixes #1827

This broke in dff1f428 because the
`$location` Angular service became unavailable to the
`StreamSearchInput` component as it was not registered in the new
dependency injection container.

This used to contain Angular filters. The last references to this were
removed in c978b6b2.