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

Dont lower the mtime of a folder when propagating changes

Properly show the warning about the missing composer autoloader

[files_external] add SMB autotest

Don't flip image in PHP 5.4

Issue/14204 revert #14171

This reverts commit c9b56084.

This reverts commit f6a452ca.

Removed anchor in config.sample.php

Ensure that passed argument is always a string

App install behind a Proxy

Some code paths called the `normalizePath` functionality with types other than a string which resulted in unexpected behaviour.

Thus the function is now manually casting the type to a string and I corrected the usage in list.php as well.

Otherwise logout can fail if the requesttoken contains a +

Improve: Index for file_map

Added two indices for file_map, that improve syncing and uploading and deleting files

generate valid human readable text for 0 

Additional controllermethodreflector inheritance tests

catch any whitespaces which might get written to the output buffer while...

Remove internal annotation

PHPStorm complained about those functions being declared as Internal. I doubt that this is actually the case since they are even in the public API.