671e9f93 Add unicode tests for image readers and writers
787f6e3a Fix errors and warnings from Kitware robot
8675c0cd Utilise KWSYS ifstream and ofstream to properly handle UTF8 filenames
b3daa15d Open files with UTF-8 encoded paths and file names

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !6122