Add a number of missing collaborators to the /rockbox/wps/AUTHORS file and create
a new header to share between the .fms, .sbs, and .wps files in the /rockbox/wps/
directory. No functional changes made, purely cosmetic.
Change-Id: Id4b22d438e340da4dfc18ec8bf0e40088bdc606e
Reviewed-on: http://gerrit.rockbox.org/368
Reviewed-by: Jonathan Gordon <rockbox@jdgordon.info>