Pure Texture to Sampled Texture Transform

Adds a transformation step to the post processing step.
Two modes are available:
1) keep
- Keeps samplers, textures and sampled textures as is
2) transform pure texture into sampled texture and remove pure samplers
- removes all pure samplers
- transforms all pure textures into its sampled counter part

Change-Id: If54972e8052961db66c23f4b7e719d363cf6edbd

Test/spv.texture.sampler.transform.frag

@@ -0,0 +1,13 @@
+#version 440
+
+uniform sampler smp;
+uniform texture2D tex;
+
+in vec2 coord;
+
+out vec4 color;
+
+void main()
+{
+  color = texture(sampler2D(tex, smp), coord);
+}