Consolidate Rendering Mode

Rendering Mode will be categorized as follow in both old and new UI .

Non-Buffered Rendering
Buffered Rendering
Read Framebuffers to Memory (GPU)
Read Framebuffers to Memory (CPU)

![screen00000](https://f.cloud.github.com/assets/3000282/831831/3ddfff98-f219-11e2-93d2-bc7b1c3af7d6.jpg)