Working SSB audio test!

* Add whiteboxd.
* Fix dsp library sincos functions.
* FIR implementation.
* RAM behavioral model.
* Driver changes to support FIR filter.
* Fix driver's ability to clear flags in FPGA.
* Fix ADF4351 register file settings.
* Remove docs from install target.
* Turn on -O2.
* Remove DDS on the transmit FPGA chain.
* Move qa_tx to use new DDS in software.
* Unify sample rates.
* Add CIC shifter so it can support any interpolation rate.
* Impulse response tests.
* Check for word aligned access on the APB3 BFM.