Release 3.8

This is a major release with several improvements, support to html list themes and shared folders. This is the list of changes:
- improved interface
- improved performance
- improved source code (thanks to guinness)
- improved support to copy associations between profiles (with "Copy to")
- changed hotkeys of special actions from Ctrl+Key to Alt+Key
- added more HTML list themes and support to select them (thanks to tpr)
- added support to apply an action to all ambiguities of a drop
- added support to Context Menu integration
- added support to duplicate associations in a profile (with "Copy to")
- added support to include filter in HTML lists (disabled by default)
- added support to include header in TXT and CSV lists (enabled by default)
- added support to shared folders with UNC paths (thanks to Michael)
- removed system integrations during installation (available from Options)
- fixed minor bugs