Diffusion Krita 50b20c13e9c2

Make KisImportExportAdditionalChecks static

Authored by tymond on May 23 2019, 7:46 AM.

Description

Make KisImportExportAdditionalChecks static

Before this commit those methods weren't static and they opened and
closed files. This commit changes methods to static and make them use
QFileInfor instead of opening files.