Change all the post processing shaders to the new system.

Removes the README.txt file in favour of a new wiki page I'm going to generate.

Data/Sys/Shaders/spookey2.glsl

@@ -1,11 +1,6 @@
-SAMPLER_BINDING(9) uniform sampler2D samp9;
-
-out vec4 ocol0;
-in vec2 uv0;
-
 void main()
 {
-	vec4 c0 = texture(samp9, uv0);
+	float4 c0 = Sample();
 	float red   = 0.0;
 	float green = 0.0;
 	float blue  = 0.0;
@@ -21,5 +16,5 @@ void main()
 		green = c0.r + c0.b;
 	}
 
-	ocol0 = vec4(red, green, blue, 1.0);
+	SetOutput(float4(red, green, blue, 1.0));
 }