SMM: Enable filtering

Johannes Pfeiferrequested to merge
JohannesPfeifer/dynare:SMM_filter into master

Allows using the HP filter, the one-sided HP filter, and the Baxter King filter in the context of SMM estimation to match filtered moments. Preprocessor implementation is in preprocessor!116 (merged). Closes #1864 (closed)

Edited by Johannes Pfeifer

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