Sound functions

Reference: [Trello](https://trello.com/card/ahk-1-1-10-soundset-soundget/4ff142712c442e040466599d/40)

Updated soundcard analysis script (it now has its own page with descriptions and downloads, though the old version is still available), and updated the documentation for the sound related functions so that they reflect the changes made in AHKv1.1.10 alpha.