Since clicking the button toggles between two states rather than
dismissing the "focus mode" header, the "X" icon doesn't feel
appropriate, so remove it.

The button's padding has been adjusted to center align the content
following the removal of the icon.

Fixes #1294

Add first iteration of UI to user-focused mode

Bump sinon from 7.3.2 to 7.4.1

Bump browserify from 16.3.0 to 16.5.0

Bump commander from 2.20.0 to 3.0.0

Bump enzyme-adapter-preact-pure from 2.0.1 to 2.0.2

Bump eslint-plugin-react-hooks from 1.6.1 to 1.7.0

Bumps [eslint-plugin-react-hooks](https://github.com/facebook/react/tree/HEAD/packages/eslint-plugin-react-hooks) from 1.6.1 to 1.7.0.
- [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 [enzyme-adapter-preact-pure](https://github.com/preactjs/enzyme-adapter-preact-pure) from 2.0.1 to 2.0.2.
- [Release notes](https://github.com/preactjs/enzyme-adapter-preact-pure/releases)
- [Changelog](https://github.com/preactjs/enzyme-adapter-preact-pure/blob/master/CHANGELOG.md)
- [Commits](https://github.com/preactjs/enzyme-adapter-preact-pure/compare/v2.0.1...v2.0.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [browserify](https://github.com/browserify/browserify) from 16.3.0 to 16.5.0.
- [Release notes](https://github.com/browserify/browserify/releases)
- [Changelog](https://github.com/browserify/browserify/blob/master/changelog.markdown)
- [Commits](https://github.com/browserify/browserify/compare/v16.3.0...v16.5.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [commander](https://github.com/tj/commander.js) from 2.20.0 to 3.0.0.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tj/commander.js/compare/v2.20.0...v3.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sinon](https://github.com/sinonjs/sinon) from 7.3.2 to 7.4.1.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinonjs/sinon/compare/v7.3.2...v7.4.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Update user-focus store, rootThread intergration for clarity

Add focused user mode for speed grader

Minor change to the component to add a button that enables or disables the focused mode for the focusedUser passed into the settings object.

Merge pull request #1287 from hypothesis/dependabot/npm_and_yarn/babel-plugin-transform-async-to-promises-0.8.14

Bump babel-plugin-transform-async-to-promises from 0.8.13 to 0.8.14

Bump preact from 10.0.0-rc.0 to 10.0.0-rc.1

Bumps [preact](https://github.com/developit/preact) from 10.0.0-rc.0 to 10.0.0-rc.1.
- [Release notes](https://github.com/developit/preact/releases)
- [Commits](https://github.com/developit/preact/compare/10.0.0-rc.0...10.0.0-rc.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [babel-plugin-transform-async-to-promises](https://github.com/rpetrich/babel-plugin-transform-async-to-promises) from 0.8.13 to 0.8.14.
- [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/v0.8.13...v0.8.14)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Add edited timestamp to annotation headers

Update the `time` utility module to more closely match
our current conventions. Also make time math consistent
(always use `ms` units), organize for concision and
rename a few references for clarity.

The only functional change is the addition of the string
"ago" to some of the relative time templating.

Refactor annotation events

Remove state logic from root-thread and place it in corresponding stores:

- deleteNewAndEmptyAnnotations moves to drafts and renamed to deleteNewAndEmptyDrafts
- events.BEFORE_ANNOTATION_CREATED's logic moves to createAnnotation in annotations store
- selection store handles REMOVE_ANNOTIONS action directly

Bump eslint from 6.0.1 to 6.1.0

Simplify root thread generation in top-level UI components

Bumps [eslint](https://github.com/eslint/eslint) from 6.0.1 to 6.1.0.
- [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/v6.0.1...v6.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump eslint-plugin-react from 7.14.2 to 7.14.3

Merge pull request #1274 from hypothesis/dependabot/npm_and_yarn/karma-coverage-istanbul-reporter-2.1.0

Bump karma-coverage-istanbul-reporter from 2.0.6 to 2.1.0

Bump @octokit/rest from 16.28.5 to 16.28.7

Merge pull request #1278 from hypothesis/dependabot/npm_and_yarn/babel-plugin-transform-async-to-promises-0.8.13

Bump babel-plugin-transform-async-to-promises from 0.8.12 to 0.8.13

Fix typo `bnt` -> `btn` in `SelectionTabs` component

Bumps [babel-plugin-transform-async-to-promises](https://github.com/rpetrich/babel-plugin-transform-async-to-promises) from 0.8.12 to 0.8.13.
- [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/v0.8.12...v0.8.13)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) from 7.14.2 to 7.14.3.
- [Release notes](https://github.com/yannickcr/eslint-plugin-react/releases)
- [Changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yannickcr/eslint-plugin-react/compare/v7.14.2...v7.14.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 16.28.5 to 16.28.7.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v16.28.5...v16.28.7)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [karma-coverage-istanbul-reporter](https://github.com/mattlewis92/karma-coverage-istanbul-reporter) from 2.0.6 to 2.1.0.
- [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/v2.0.6...v2.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>