Rename and move permissions are set when a file is updatable

Fix download spinner to work with CSS styles

A recent change replaced img elements with CSS icons for file actions.
This fix adjusts the logic to work properly with CSS icons instead of
images.

* Fix unit tests

Keep "encryptedVersion" when calling `\OC\Files\View::copy`

Exclude the assets folder from integrity check

When calling `\OC\Files\View::copy` we should also keep the version to ensure that the file will always have the correct version attached and can be successfully decrypted.

To test this the following steps are necessary (from https://github.com/owncloud/core/issues/22781#issuecomment-191328982):

1. setup a new ownCloud 9.0 beta2
2. enable encryption
2. upload a docx (5.7MB large)
3. upload the same file again and overwrite the existing file
4. I can download the original file and the first version
5. I restore the first version
6. restored version can no longer be downloaded with the error described above

The manual cache operation in `\OCA\Files_Versions\Storage` is unfortunately necessary since `\OCA\Files_Versions\Storage::copyFileContents` is not using `\OCP\Files\Storage::moveFromStorage` in the case when an object storage is used. Due to the workaround added in https://github.com/owncloud/core/commit/54cea05271b887f1c8062c034741df869bc0f055 the stream is directly copied and thus bypassing the FS.

We should not scan the assets folder as this can contain user specific content. Partially addresses https://github.com/owncloud/core/issues/22803

untangle different user manager instances, fixes #22770

Remove browser autocomplete in new file menu

Minor grammar in config.sample.php

Fix this here in the source so it will propogate into the documentation.
Edit was already applied in https://github.com/owncloud/documentation/pull/2208 but needs to be done here at the source.

Translate strings of federation admin section

Add Versions app header to config.sample.php

Master is now 9.1

Update copyright information and author file

Exclude custom data directory from integrity checker

allow putting the part file in the view root

Use readiness notification socket to be absolutely sure this works

Probably nice for the people that contributed to 9.0 to see themselves in the AUTHORS file :)

We should not scan any custom data directory in the integrity checker as well. Otherwise this would lead to a massive increased update time that may likely exceed the timeout.

To test this:

1. Install ownCloud 8.2.2, set as data dir another folder than `data` such as `data-asdf`. Make sure that folder lives in the web root as well.
2. Update that instance to 9.0.0 beta2 => Errors are shown in the code integrity check
3. Apply this patch and trigger the rescan in the admin settings => No errors are shown anymore (can also do a new update with that patch applied)

Fixes https://github.com/owncloud/core/issues/22698

Checksum intergration tests and fixes

remove remote address book if access was revoked