Detect old NSS and OpenSSL versions

Double slash for SMB storage id for compatibility

set logger in constructor

This will detect old NSS and OpenSSL versions and show appropriate errors in the admin interface.

Fixes https://github.com/owncloud/core/issues/17901

Mimetypedetector

Remote shares should be uique

Fix tooltip for modification time

get header size before we open the file to avoid locking exception

Only set is encrypted when encryption is enabled

In order to properly test the mimetype function:

* constructor takes path to configdir
* Added unit tests for mimetype (only if vfsStream is available)

* Copied unit tests from old functions

check if the user is trying to scan a valid path

Implement OCP Since Check for classes and interfaces

Fix title attribute of tipsy shim

Allow classes in <h2> tags

[MASTER] Update sabre-dav to 2.1.6

LDAP: when checking group for matching filter, also take base DN into…

Previously something like `<h2 class="inlineblock"><?php p($l->t('Some title')) ?></h2>` was shown as `<h2 class="inlineblock">Some title` within the sidebar instead as `Some Title` due to the fact that the regex was catching these classes but was not properly running the string replace function.

Add `fallback` to shim

Tipsy also supported the `fallback` element which will now not work anymore. To enhance compatibility we shall also implement it in the shim.

Fixes https://github.com/owncloud/core/issues/17870

Use a hook to integrate sharing password verification