- show filename in fullscreen
- add option for chosing background colour
- add indication for being busy when loading image (while traversing direvtory)
- add option "zoom to fitting power of 2 (fit exactly otherwise)"
- add option of when to use which scaling algorithm (nearest neighbor while fitting to power of 2, bilinear/bicubic otherwise,… depending on or independent from full-screen or windowed view)
- use wxCmdLineParser, treat first positional argument as filename
- add option "reset exif orientation flag after rotate"
- rotate thumbnail, too
- enable global exceptions, build against debug libraries
- scan folder in background