VEAI create,save and modify individual project files

VEAI needs the ability to create, save and modify individual project files.

This is essential to allow separating jobs as individual projects as well as returning to the project over the course of time or when a new version of VEAI is released to re-process the source clips with the latest improved AI models.

In addition project files could allow dividing the work up between multiple workstations all processing at the same time to speed up the turnaround time.