Bump webpack from 4.23.0 to 4.23.1

Bump eslint from 5.7.0 to 5.8.0

Bump jsdom from 12.2.0 to 13.0.0

Bumps [jsdom](https://github.com/jsdom/jsdom) from 12.2.0 to 13.0.0.
- [Release notes](https://github.com/jsdom/jsdom/releases)
- [Changelog](https://github.com/jsdom/jsdom/blob/master/Changelog.md)
- [Commits](https://github.com/jsdom/jsdom/compare/12.2.0...13.0.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [eslint](https://github.com/eslint/eslint) from 5.7.0 to 5.8.0.
- [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/v5.7.0...v5.8.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [webpack](https://github.com/webpack/webpack) from 4.23.0 to 4.23.1.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.23.0...v4.23.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Fix jshint es version (for scrutinizer)

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Enhance message sending UX

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Save compose changes as drafts

Fix outdated composer.lock on refactor/vue branch

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Add back next/previous message shortcut

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Add back desktop notifications for new messages

Bump webpack from 4.22.0 to 4.23.0

Collapse unimportant folders by default

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Disable slow Scrutinizer security analysis

Bumps [webpack](https://github.com/webpack/webpack) from 4.22.0 to 4.23.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.22.0...v4.23.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Add back background sync of inboxes

Remove dead foldersyncservice

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Vue envelope popover menu

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Backport master changes to Vue rework branch

Move sources to /src dir

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>