Updated GuiConstants; DisplayImage is now slightly larger but still
16:9.
Updated the GUI Layout to match the new MockUp. ToolbarPanel and
StatusPanel are now properly positioned around the VideoPanel.

VideoPanel now has the correctly sized default.

Renamed the updateImage method on VideoPanelViewController to
updateVideoDisplay for clarity on functionality.

Signed-off-by: Theo Chupp <chuppthe@msu.edu>