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/invertedoutline.glsl

@@ -1,14 +1,7 @@
-SAMPLER_BINDING(9) uniform sampler2D samp9;
-
-out vec4 ocol0;
-in vec2 uv0;
-
-uniform vec4 resolution;
-
 void main()
 {
-	float4 c0 = texture(samp9, uv0);
-	float4 c1 = texture(samp9, uv0 + float2(5,5)*resolution.zw);
+	float4 c0 = Sample();
+	float4 c1 = SampleOffset(int2(5, 5));
 
-	ocol0 = c0 - c1;
+	SetOutput(c0 - c1);
 }