[ENHANCEMENT] Default filename and folder for a new document Save As
Right now we get Untitled with the date and time as a file name. I believe the folder might be some sticky from the last save.
If a project is opened with some image file, RAW/JPG/TIF/PNG, then the project name should be that of the image file. The default Save As folder should be the folder of the opened image. I believe the '.imerge' file should be a sidecar to the source RAW/TIF/etc.
This also includes a file being opened from the command line. Like some file browser, DAM, that execs Imerge passing the RAW file via the cmdline.