Begin a GUILayout block of GUI controls in a fixed screen area.
Left
Left screen coordinate.
Top
Top screen coordinate.
Width
Width of area.
Height
Height of area.
Normalized
Use normalized screen coordinates.
Style
Optional GUIStyle name in current GUISkin.
Must be matched with GUILayout End Area.
BeginArea/EndArea cannot be nested.
See also: GUILayout.BeginArea
