Update issue #211 : Support full screen playback in EVR video renderer
NB : it's not possible to Alt-Tab away from full screen EVR playback at present - need to forward keystrokes to parent to allow cancelling full screen playback 

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@363 c2f33eb2-41b2-391d-4cb4-d9d0608729ba