Moved the perspective window to the upper-left for GFWL integration
Graphics presentation for the perspective window uses no parameters
Focus is attained for each view when the mouse is clicked within its bounds

|SOURCE|
[Editor.Designer]
* Perspective view has been changed to the upper-left view as it is the first
  one, which the GraphicsDevice.Present method without parameters renders to
  the default window handle
* The splitter control correctly splits to half the window's width
[GraphicsDeviceControl
* A test is performed when ending rendering to verify if the control is a
  perspective or othographic view, as the graphics device cannot use a source
  rectangle with a window handle when updating the GFWL service
* When the mouse is clicked on a control, focus is gained.  This is to allow
  for the GFWL service to listen for key presses within the control.
[PerspectiveViewControl]
* Changed the right-click context menu action to sign in with a profile if the
  user is not already signed in
* OnCreateControl uses the GraphicsDeviceControl's m_Services to initialise the
  GamerServicesDispatcher