World Wind v1.4

'''2005-04-18: Initial CVS dump of v1.4 "Pre-Alpha Test" code. - Chris Maxwell'''
 * Under CVS branch "WORLDWIND_V1_4_DDH_20050418"
 * Implements mult-image terrain draping with opacity support
 * Opacity support depends on a vertex shader (therefore, the video card must support at least an early vertex shader)
 * Code must be added to check for vertex shader version and set a variable in DrawArgs that signifies the vertex and pixel shaders
 * New SurfaceRenderer class as part of the World object, use this to render images on planet surface from now on
 * ImageLayer and QuadTileSet use SurfaceRenderer exclusively now, possible change later to support use w/o SurfaceRenderer
 * Have not tested animations using SurfaceRenderer, work needs to be done in this regard
 * Need to modify ImageLayer and QuadTileSet to ignore SurfaceRenderer if "DistanceAboveSurface" greater than zero
 * Please update this page with stability issues.