Software-only ScanTarget?

[cesss]

Doing the signal processing on the GPU is a very good idea (it's one of the GPU's strong use cases), but I believe it would be nice to have a software-only implementation, so that CLK could be built as SDL as its only dependency if needed. If the signal processing work is written in plain C, this would open several possibilities (ie: it could be possible to put that loop inside an OpenCL kernel, or to parallelize it with OpenMP, or just perform a plain -without parallelization- build of the loop as old-good C).