Overlay the user Shaders/ over the shared one to avoid copying files

Data/Sys/Shaders/sepia.glsl

@@ -0,0 +1,16 @@
+uniform sampler2D samp9;
+
+out vec4 ocol0;
+in vec2 uv0;
+
+void main()
+{
+	vec4 c0 = texture(samp9, uv0);
+	// Same coefficients as grayscale2 at this point
+	float avg = (0.222 * c0.r) + (0.707 * c0.g) + (0.071 * c0.b);
+	float red=avg;
+	// Not sure about these coefficients, they just seem to produce the proper yellow
+	float green=avg*.75;
+	float blue=avg*.5;
+	ocol0 = vec4(red, green, blue, c0.a);
+}