Flatten Movies specifications

Utilities & Operating Systems: Applets & Add-Ins; Automation Software; Backup Software; Battery Utilities; Calculators; Data Transfer & Sync Software; Diagnostic Software; File Compression; File Management; Maintenance & Optimization; Operating Systems & Updates; Other; Portable Applications; Printer Software; System Utilities; Uninstallers

Many thanks for your patience and bugs reports!
This is a clean up of my first release, as such the action should work in a more predictable way.
Fixed a bad design decision that wouldn't allow to save the destination folder.
Better handling of Quicktime in a threaded environment this version should be more responsive.