Lookahead for existing processed frames in the processing chain

[pozitronik]

It is about the case, when a task was stopped, and already processed frames deleted by user (as example, extracted frames when they are already swapped, and now enhancing in progress). Sinner will reprocess those frames again on the next task run, although they are not required anymore.
There is required some lookahead procedure to determine, what processor is running now. It is simple: find last state folder with files, look, what frames are still unprocessed, and prepare only them (if they're not exists).

[pozitronik]

This feature also might include the ignore of not existed target file, if every required frame already exists.