Added capabilities context and tests

Don't append redirect URL if user is logged-in

Move files/ajax/scan.php to background job

Use URLGenerator instead of hard-coded WEBROOT

Replace OC_Config in setup

Reduce OC_Config usage in tests/

Fixes https://github.com/owncloud/core/issues/20922

reuse code

Add different storage status error codes managed by StoragedNotAvailableExc…

Added test case about downloading by range a public shared file

Replace more of OC_Config in tests with IConfig calls

Replace OC_Config in tests with IConfig calls

[3rdparty] Bump doctrine/dbal deps

Systemtags better not found exception

Also add metadata for postDelete hooks triggered from the view

User IUser::getEMailAddress() all over the place

Only return the exact match, when it's allowed

Allow framing 'self'

Replace old config code with usage of proper APIs

This is required by the pdf viewer, since the files app on master uses the AppFramework it had applied the more strict defaults which made it not work on master.