Redesign how KBMOD encodes data for on GPU use

[jeremykubica]

This PR moves the encoding of the Psi and Phi arrays into an object to provide more flexibility and better modularity. The major goals of this change include:

• Restore the interleaved psi/phi approach from the original code to improve memory locality on the GPU.
• Allow the code to copy the psi/phi data to GPU memory once and run multiple searches. This is not currently used anywhere, but will allow us to reduce the memory needed to store results by breaking the search into batches.
• Provide direct hooks for reading the encoding that can be used for testing (previous code was tested indirectly via a full search)

The code is a bit complicated due to the fact that CUDA cannot call non-device functions from a device function (including the getters/setters for a class).

[maxwest-uw]

have a few comments to make sure I understand how the kernel changes work, but otherwise looks good!