Add alternate shadow volume rendering pathway (layered geo)

shader/shadow/cap.vert

@@ -1,10 +1,6 @@
 #version 450 core
 layout (location = 0) in vec3 position;
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
-uniform vec3 lightPos;
-uniform vec4 lumRad;
-out vec3 dField;
-out vec3 lum;
 void main()
 {
     gl_Position = vec4(position,1);