custom flag or tag on successful conversion?#166

I think the conversion tool needs some sort of tag or custom flag we can easily filter for so there is less user troubles when mass converting and exporting. Obviously most importantly its written to the metadata files and not just in the db! Appended to Notes or a tag i guess? Could leave the option with an open string that could be set per export/convert preset to open for more workflows aswell! Reasons for wanting this is that its easy to loose track of where you are if you dont flag them right away. And sure you can select a bunch of files, click convert with the setting and quickly edit the metadata. But this has failed be in the past, where its either slow, loose the highlight and other issues. Quite a few things you need to be aware of so you dont mess it up at scale. Having something that is automatically applied on the successful conversion would remove the issue entirely while opening for workflows. Say the user could have an preset that converts an users .cbw files to .cbz with the original file format (AKA a download) and the preset could flag or write that its downloaded. Or taking the original image formats and converting them in another preset and calling it converted or compressed with the encode used and quality %. I guess it can just append the preset name. that would also make sense i guess instead of giving users another field, less control that way though!