* Advanced draft decim /4 just waterfall ok
* apply some Kall's corrections + formatting
* Tidy up both decim_factors
* New refine optimizations
* Format issues
* more format issues ...mmmm
* comments update
* WIP Cleanup
* WIP
* WIP - add variant
* Use std::visit to dispatch MultiDecimator -- fluent API
* Clean up comments
* Merge next and fix compilation
* Fix odd loop in BlockDecimator
* Clean up spectrum math
* Descibe spectrum update math better, more clear math.
* Apply spectrum interval correction at 1.5M
* Increase replay buffer to handle x4 ovs
---------
Co-authored-by: Brumi-2021 <ea3hqj@gmail.com>
Permit decimation_factors other than 2.
Permit tap counts != 64 (but still must be multiple of 8).
Half the amount of tap memory required.
Performance is significantly degraded due to greater flexibility -- most likely due to separate sample buffer shift phase, instead of performing shift during output sample calculation.
