Enhancement: Added 'uriaction' parameter to softkeyset, which makes it possible to intercept a softkey press and handled it using a custom implementation by calling a url instead (experimental feature). Custom Feature Requested by Cody Miller-Kelly (Vertiro)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5780 43c1dc8c-776e-4df2-8ef1-6e829299be21