Improve code style consistency by always putting the `export` keyword
at the site of the var/function/class declaration where possible.

Convert remaining CommonJS modules to ES modules

Following the conversion to an ES module, make `DEBOUNCE_WAIT` separate
export rather than a property of the default export.

These modules have default exports and are imported by CoffeeScript
modules. Since we use CoffeeScript 1.x which doesn't support
`import`/`export` syntax, we use destructuring to access the default
export.

This is necessary to support mocking the JS generated by the following
CoffeeScript syntax:

```
{ default: FooBar } = require("./foo-bar")
```

This will be used in CoffeeScript modules that import ES modules with
default exports.

Bump @sentry/browser from 5.11.0 to 5.11.1

Bump terser from 4.5.1 to 4.6.3

Bump sass from 1.24.4 to 1.25.0

Bump core-js from 3.6.3 to 3.6.4

Bump sinon from 8.0.4 to 8.1.0

Bumps [@babel/core](https://github.com/babel/babel) from 7.8.0 to 7.8.3.
- [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/v7.8.0...v7.8.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [core-js](https://github.com/zloirock/core-js) from 3.6.3 to 3.6.4.
- [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/v3.6.3...v3.6.4)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.601.0 to 2.606.0.
- [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/v2.601.0...v2.606.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [terser](https://github.com/terser/terser) from 4.5.1 to 4.6.3.
- [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/v4.5.1...v4.6.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 5.11.0 to 5.11.1.
- [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/5.11.0...5.11.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sass](https://github.com/sass/dart-sass) from 1.24.4 to 1.25.0.
- [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/1.24.4...1.25.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.8.2 to 7.8.3.
- [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/v7.8.2...v7.8.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@babel/preset-react](https://github.com/babel/babel) from 7.8.0 to 7.8.3.
- [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/v7.8.0...v7.8.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) from 7.17.0 to 7.18.0.
- [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/v7.17.0...v7.18.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sinon](https://github.com/sinonjs/sinon) from 8.0.4 to 8.1.0.
- [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/v8.0.4...v8.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Convert src/shared/{polyfills, test, settings.js} to ES modules

Add `permissions` util and remove permissions-init logic from components

Convert all the modules under src/shared to ES modules except for those
which:

 1. Would have a default export if converted to an ES module AND
 2. Are imported by a module still written in CoffeeScript in src/annotator/

For modules which meet these criteria there is some additional work
required to make the tests for the CoffeeScript modules still work after
the conversion.

Migrate “modern” components away from using the `permissions` service
and instead use the `permissions` util.

Note: `permissions` service will hang around until the old `annotation`
controller is gone fully

- Remove permissions init from `annotation`, `AnnotationOmega`
- Add permissions init, via util and state, to `annotations` store module
- Remove unused methods from `permissions` service

Copy functionality of `permissions` service minus `localStorage`
dependency into a new util; add `isPrivate` method for convenience.

Add an `align-items` rule to the focused-mode button

Add `defaults` store module and `persistedDefaults` service

Add an alignment rule to CSS so that button text aligns vertical
center in Firefox.

Add a new store module for managing state of client-side defaults
and a new service for a) retrieving those values from where they
were persisted on initialization and b) subscribing to the store
to watch for changes on those defaults—and persisting those changes.

Update the `permissions` service to get/set its default annotation
privacy level through the store instead of directly through
`localStorage`.

Convert additional src/annotator/ modules to ES modules

This converts all modules except those which:

 1) Are written in CoffeeScript OR

 2) Are written in JS AND have a default export AND are imported from a
    module written in CoffeeScript.

    This last case is a bit more complex to handle and needs a little
    investigation or a decision to punt it to after the CoffeeScript =>
    JS conversion is complete

Convert most modules in src/annotator to ES modules

In preparation for conversion to an ES module, hoist an import to the
top of the file.