Bump vue-router from 3.0.1 to 3.0.2

Bumps [vue-router](https://github.com/vuejs/vue-router) from 3.0.1 to 3.0.2.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Commits](https://github.com/vuejs/vue-router/compare/v3.0.1...v3.0.2

)

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

Backport (forward port?) master changes to Vue branch

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

Add Nextcloud 16, drop 14 support and adjust build matrix

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

Use the actual constructed query in the AccountMapper

The routes.php can just return an array

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Use multiselects for the recipient selection

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

[Security] Bump underscore.string from 3.3.4 to 3.3.5

Bumps [underscore.string](https://github.com/epeli/underscore.string) from 3.3.4 to 3.3.5. **This update includes security fixes.**
- [Release notes](https://github.com/epeli/underscore.string/releases)
- [Changelog](https://github.com/epeli/underscore.string/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/epeli/underscore.string/compare/3.3.4...3.3.5

)

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

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

Bumps [nextcloud-server](https://github.com/ChristophWurst/nextcloud-server) from 0.15.7 to 0.15.9.
- [Release notes](https://github.com/ChristophWurst/nextcloud-server/releases)
- [Commits](https://github.com/ChristophWurst/nextcloud-server/compare/v0.15.7...v0.15.9

)

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

Merge pull request #1324 from nextcloud/dependabot/npm_and_yarn/refactor/vue/nextcloud-server-0.15.9

Bump nextcloud-server from 0.15.7 to 0.15.9

Bump webpack from 4.25.1 to 4.26.0

Bumps [nextcloud-server](https://github.com/ChristophWurst/nextcloud-server) from 0.15.7 to 0.15.9.
- [Release notes](https://github.com/ChristophWurst/nextcloud-server/releases)
- [Commits](https://github.com/ChristophWurst/nextcloud-server/compare/v0.15.7...v0.15.9

)

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

External avatars

* Memoize avatar url fetching promise for simple functional caching
* Add extern avatars settings checkbox

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

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

This reverts commit 3d49dd2b.

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>

https://probot.github.io/apps/lock/



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

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

Bump nextcloud-vue from 0.4.3 to 0.4.4

Bumps [webpack](https://github.com/webpack/webpack) from 4.25.1 to 4.26.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.25.1...v4.26.0

)

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

Bumps [nextcloud-vue](https://github.com/nextcloud/vue-components) from 0.4.3 to 0.4.4.
- [Release notes](https://github.com/nextcloud/vue-components/releases)
- [Commits](https://github.com/nextcloud/vue-components/compare/v0.4.3...v0.4.4

)

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

Fix typo in attachments button

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>

Fix outdated message flashing when navigation away

Remove dead attachment service code