Dont update the cache when working with part files

add documentation issue trackers and use https everywhere

Add loadfeedback

Allow AppFramework applications to specify a custom CSP header

Fix invalid `ini_set` directives

Revert "add debug log for memcache instantiation"

Check if instance is not yet installed

Somehow they got messed up. Because PHP does automatic type juggling this has worked before as well however it's not guaranteed that this might work in the future as well.

Activity/225 Move displaying of files related activities to files app

Activity/225 sharing extension

Due to a security hardening in 8.1 a missing value of empty trusted domains in the config would provoke an error as this was misused by a lot of users.

This caused a problem where the initial installation happened from another domain than 127.0.0.1 as in this case the domain was considered untrusted as no value was defined. However, this special case should not get intercepted.

To test:
- [ ] Installing ownCloud on 127.0.0.1 works
- [ ] Installing ownCloud on another domain / IP works
- [ ] When setting up ownCloud from 127.0.0.1 and accessing it from the domain above the trusted domain error should be shown if not specified in the config

Fixes https://github.com/owncloud/core/issues/14320

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