Exclude PhpStorm internal stuff from sniffing
Exclude PhpStorm internal stuff from sniffing

Whenever project uses `file templates` for `PHP` classes, they are saved in `/project/.idea/fileTemplates/internal/` but `sniffer` finds them and complains:
```
FILE: /project/.idea/fileTemplates/internal/PHP Class.php
----------------------------------------------------------------------
FOUND 6 ERRORS AFFECTING 2 LINES
----------------------------------------------------------------------
  7 | ERROR | [x] There must be one blank line after the namespace
    |       |     declaration
  7 | ERROR | [x] There must be one blank line after the namespace
    |       |     declaration
 10 | ERROR | [ ] Class name doesn't match filename; expected "class
    |       |     PHP Class"
 10 | ERROR | [x] Opening brace of a class must be on the line after
    |       |     the definition
 10 | ERROR | [x] Opening brace of a class must have one extra new
    |       |     line between itself and the first content.
 10 | ERROR | [x] Closing brace of a class must have one extra new
    |       |     line between itself and the last content.
----------------------------------------------------------------------
PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------
```
spryker/code-sniffer,spryker/code-sniffer