Part 16 - Time to test out our new Quadbatch class and QuadEffect.fx

Part 15 - The QuadEffect.fx is similar to the spriteEffect and allows us to make modifications and add other vertex shaders and pixel shaders. We'll mostly use pixel shaders with sprites (It's relatively inexpensive to do CPU-side vertex alterations anyway for wobbling plants or whatever). We can eventually add a flag and other texture options to include normal-maps (or bump maps) to create lighting fx. It's not necessary to do all fx in one pass or on one rendertarget, but doing more at once means a little more time for the GPU to pump out even more eye-candy if need be.