It seems the zero-phase crossover worked okay after all but teh test was
wrong.
Small fixes in characteristic time sets
ITU_R_468::Filter is now somewhat more flexible as far as setting
configurations and filtering.
SpreakParameter fixed small const bug
Added the concept of a values set that has an associated value range.
Added the concept of a channel range fox more flexible routing.
Limiter has a separate Limiter::Detector responsibility and various
implementations like the FixedChannelLimiter and a limiter that has a
programmable channel range.
Introduced the concept of a threshold range (depending on maximum type
value)
Located template usage only to places where they're actually used.
Removed the way-over-engineerde generic configuration system.
Renamed ChannelRange to IndexRange and made it possible to have
MultibandRmsLimiter use two summing outputs, based on a summing range.