REQ: Skip source image if target exists with skip option

[ertug]

If skip is selected for when output files already exists in the options, there is no need to read original image in a batch job. Please check if target exists and pass to next source file without reading it. That will save lots of time and bandwidth of VPN and network. Thanks.

[xnview]

ok, but if filename contains placeholder for image information or metadata, i need to load it