add recursive copy polyfill for storage backends

Replace readonly wrapper with permissions mask

add occ tool to delete versions

Reorganize sampe.config.php

Check if response could get generated

Improve federated cloud sharing activities

Add OCS API to send, get, accept and decline remote shares

Add occ app:list and ldap:show-config to issue_template.md

Kill more legacy classes

Remove file mapper - was only use in Windows and never worked properly

Flysystem base adapter

Move away from private static function OC_Util::getUrlContent

Remove bogus test result

This file was created during a bogus test run that created files in the
wrong location, and was checked in by mistake.

Update reference to include newest php-parser

add occ command to remove deleted files

Correct lower than wording

Remove \OCP\App::register()

[app code check] add OC_Search_Provider and _Result

Do not show static share owner if not available