Licensing page

[joslloand]

Consider adding a page describing licensing. This would detail licensing for:

• Software: JSFX, GPLv3
• Software: SC3, GPLv3
• Documentation: SC3, CC BY-SA 3.0
• Kernels: CC BY-SA 3.0
• Example soundfiles: citations

There could also be a notice regarding 3rd-party elements. Though, these are listed in the various repos.

By including a licensing page, each separate download page could be directed to a single page with appropriate tags. The thought is this could help keep licensing notices on the web page in sync.