Enhancement: Update SDK

We've updated the ownCloud SDK to version 2.0.0.

- Change - Drop Internet Explorer support: https://github.com/owncloud/owncloud-sdk/pull/966
- Change - Pass full file or directory path to methods of Files class: https://github.com/owncloud/owncloud-sdk/pull/971
- Change - Remove webdav v1 api support: https://github.com/owncloud/owncloud-sdk/pull/962
- Change - Use peerDependencies instead of dependencies: https://github.com/owncloud/owncloud-sdk/pull/979
- Bugfix - Graceful reject for failing network request in OCS: https://github.com/owncloud/owncloud-sdk/pull/977

https://github.com/owncloud/web/pull/6309
https://github.com/owncloud/web/pull/6287
https://github.com/owncloud/owncloud-sdk/releases/tag/v1.1.2
https://github.com/owncloud/owncloud-sdk/releases/tag/v2.0.0
