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

 Add registerAlias method to shortcut interface registration #17714 

Remove commented code

Replace jQuery tipsy with bootstrap tooltip

Adding error handling in case setting the password fails

assign password change error message to correct object

Update blueimp-md5 to 1.1.0

fix for  #17817

make sure that there is a space between user- and admin-documentation

Add public api for Doctrine QueryBuilder and ExpressionBuilder

Yes this is pretty empty, but it's the truth:

https://github.com/blueimp/JavaScript-MD5/compare/1.0.3...1.1.0

improved app description for the default encryption module

Fixing line comments and indentation, closes #17781

Only run some preview unit tets if imagemagick is available