Release 3.7

This is a minor release with performance improvements, Guide replacement, support to playlist creation and various fixes. This is the list of changes:
- renamed "pattern" in "association"
- replaced outdated "Help.chm" file with new "Guide.pdf" file
- added %Documents% environment variable
- added support to create playlists of dropped files in a selected folder (hold Ctrl+L at drop)
- added two list properties (Absolute Link and Relative Link)
- fixed memory leak during scroll of profiles
- fixed minor bugs