Adding Capabilities struct and osgwcaps application.

git-svn-id: http://osgworks.googlecode.com/svn/trunk@470 c67418bc-a6eb-11de-8ba5-91705c1537ed
Oops. Forgot to add "osgwcaps".

git-svn-id: http://osgworks.googlecode.com/svn/trunk@471 c67418bc-a6eb-11de-8ba5-91705c1537ed