Update phpseclib to version 0.3.9.

Add mapping for a broken varchar type.

Use APCu only if available in version 4.0.6 and higher

Optimize quota calculation for propfind

Correctly create activities for public downloads

Encode parameters in `OC.generateUrl` by itself

Remove Null Byte Check

This function is often used in a wrong and potential dangerous way... Thus we should escape the URL per default and offer developers to disable the automatic escaping via an option parameter if they really want that behaviour.

Might break some things, however, those things are then easy to fix and we really have a ton of bugs caused by this...

Fixes https://github.com/owncloud/core/issues/14228

This is not relevant anymore since we require PHP 5.4

APCu before 4.0.6 is unbelievable buggy and tend to segfault the PHP process (i.e. the whole webserver)

This potentially fixes https://github.com/owncloud/core/issues/14175

Requires a backport to stable8

Refactor OC_Request into TrustedDomainHelper and IRequest

Avatars in share dialog

This changeset removes the static class `OC_Request` and moves the functions either into `IRequest` which is accessible via `\OC::$server::->getRequest()` or into a separated `TrustedDomainHelper` class for some helper methods which should not be publicly exposed.

This changes only internal methods and nothing on the public API. Some public functions in `util.php` have been deprecated though in favour of the new non-static functions.

Unfortunately some part of this code uses things like `__DIR__` and thus is not completely unit-testable. Where tests where possible they ahve been added though.

Fixes https://github.com/owncloud/core/issues/13976 which was requested in https://github.com/owncloud/core/pull/13973#issuecomment-73492969

Return milliseconds instead of seconds for lastLogin - refs #14005

Add visibility to interface to make scrutinizer 1 step happier

add debug log for memcache instantiation

Remove unused function and correct PHPDoc

New SMB storage backend

Implement php code checker to detect usage of not allowed private ...

Add an array implementation of cache and use it if we are not debugging

URLEncode logout attribute

Add `rel="noreferrer"` where possible and switch to HTTPS

console commands shall not be limited with respect to execution time

[files_external] ftp tests