on windows open resources will be locked while the stream is open.
closing the resource allows deletion below

using $internalPath within call to self::correctFolder() because $path inside of it is not processed properly due to directory separator on Windows.

using $internalPath within call to self::correctFolder() because $path inside of it is not processed properly due to directory separator on Windows.
error logging has been added  in case the given 4path is not found within self::correctFolder

Now slugify is performed on whole filename (including extension). Changed method of adding index number (using regular expressions pathinfo() method removed).

Fixing UPDATE error in filecache table when renaming files by calling move(). Add storage id to the where clause to avoid updating entries of other users.

This reverts commit 079f918d.