Added conservative rasterization example

Refs #422

data/shaders/conservativeraster/fullscreen.vert

@@ -0,0 +1,14 @@
+#version 450
+
+layout (location = 0) out vec2 outUV;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
+void main() 
+{
+	outUV = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+	gl_Position = vec4(outUV * 2.0f - 1.0f, 0.0f, 1.0f);
+}