Add an image format for pointers to color/depth buffers
The IceTImage object expects a single allocated buffer in which both the color and depth is encoded. This is convienient for passing images in a single message. However, when interfacing with client code, it is typical to have them in separate buffers. Thus, we have a secondary dense image format that has pointers to these two buffers. It should be able to do everything a normal image can do except be packaged for a send or be written to.
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