- Wait for a specific event, the observer callback being called, when
   possible. This avoids a possible issue where
   `ResizeObserver`/`MutationObserver` callbacks would not be delivered
   within the fixed time
 - Fix a typo in the name of the test file

Original issue report: https://hypothes-is.slack.com/archives/C1M8NH76X/p1574692275043700

Bump autoprefixer from 9.7.1 to 9.7.2

Bump sass from 1.23.6 to 1.23.7

Bump scroll-into-view from 1.12.2 to 1.12.3

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.7.1 to 9.7.2.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.7.1...9.7.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump angular-mocks from 1.7.8 to 1.7.9

Bump postcss from 7.0.21 to 7.0.23

Bumps [angular-mocks](https://github.com/angular/angular.js) from 1.7.8 to 1.7.9.
- [Release notes](https://github.com/angular/angular.js/releases)
- [Changelog](https://github.com/angular/angular.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/angular/angular.js/compare/v1.7.8...v1.7.9)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump angular-route from 1.7.8 to 1.7.9

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.21 to 7.0.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.21...7.0.23)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #1534 from hypothesis/dependabot/npm_and_yarn/karma-coverage-istanbul-reporter-2.1.1

Bump karma-coverage-istanbul-reporter from 2.1.0 to 2.1.1

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.7.1 to 7.7.4.
- [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/v7.7.1...v7.7.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint](https://github.com/eslint/eslint) from 6.6.0 to 6.7.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v6.6.0...v6.7.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.573.0 to 2.578.0.
- [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/v2.573.0...v2.578.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [karma-coverage-istanbul-reporter](https://github.com/mattlewis92/karma-coverage-istanbul-reporter) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/releases)
- [Changelog](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/compare/v2.1.0...v2.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [angular-route](https://github.com/angular/angular.js) from 1.7.8 to 1.7.9.
- [Release notes](https://github.com/angular/angular.js/releases)
- [Changelog](https://github.com/angular/angular.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/angular/angular.js/compare/v1.7.8...v1.7.9)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [scroll-into-view](https://github.com/KoryNunn/scroll-into-view) from 1.12.2 to 1.12.3.
- [Release notes](https://github.com/KoryNunn/scroll-into-view/releases)
- [Changelog](https://github.com/KoryNunn/scroll-into-view/blob/master/CHANGELOG.md)
- [Commits](https://github.com/KoryNunn/scroll-into-view/commits)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sass](https://github.com/sass/dart-sass) from 1.23.6 to 1.23.7.
- [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/1.23.6...1.23.7)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/core](https://github.com/babel/babel) from 7.7.2 to 7.7.4.
- [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/v7.7.2...v7.7.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/preset-react](https://github.com/babel/babel) from 7.7.0 to 7.7.4.
- [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/v7.7.0...v7.7.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Rename the username to userid in selection module

The username was really the userid and was named incorrectly.
Still allow username in the config to work in the meantime until its depreciated in LMS

Convert SASS files to SASS modules

Prepare SASS files for transition to SASS modules

Update icons in `MarkdownEditor`; add Help Link

Merge in recent changes to app styles.

Extract `ShareLinks` component

Fix conflicts in excerpt.scss

Migrate .scss files to SASS modules using:

```
sass-migrator module --load-path=node_modules/ --migrate-deps
src/styles/annotator/annotator.scss src/styles/sidebar/sidebar.scss
```

This was previously done for the lms app in https://github.com/hypothesis/lms/pull/1057

This defines `u-*` classes which are used in various places.