DropIt v6.0

This is a major release with improvements and fixes. This is the complete list of changes:
- improved interface
- improved performance
- integrated "Compress" and "Create List" options in associations (removed globally)
- integrated "Consider rules as Regular Expressions" option in associations (removed globally)
- integrated "Pause until opened file is closed" option in associations (removed globally)
- added "Remove source after processing it" option in associations for some actions
- added option to "Always scan subfolders" or try to process them (e.g. to remove empty subfolders)
- added support to define a path in Rename field to move renamed files/folders
- added support to set associations as Favourites that have priority in case of multiple matches
- fixed some minor bugs