Fixes https://github.com/owncloud/core/issues/10366

Users should not be able to enable debug mode on their own by setting a cookie. Using debug mode might leak too much information about the environment or have other unexpected behaviour.

We should backport this.

in order to prevent false-positives on the code checker - exec and eval will not longer be grepped for

ref #10392

ref #10392

Properly initialize $apps array

Determining the file size using the exec() method is implemented for Linux, BSD, and Windows. However, on systems matching neither platform name (like SunOS), the fall-through path will return a file size result constituting a zero size instead of an invalid null return value.

* instanceof \OC\Files\View
* fix misplaced paranthesis
* remove misplaced character in comment