BlockBiquad takes kind, f0 (center frequency) & Q (sharpness)
block type arguments and calculates the actual filter coefficients
every frame.
This allows the filter characteristics f0 and Q to be changed dynamically
from LFOs & arithmetic blocks.
A new manual test demonstrates this on a host computer, playing a simple
tone that is dynamically filtered.
Apply envelope & panning after biquad filtering.
This may fix the weird popping problem. It also reduces the number
of operations that are done "in stereo", so it could help performance.
It also fixes a previously unnoticed problem where a ring-modulated
waveform had 2x the amplitude of an un-modulated waveform.
The test differences look large but it's because some values got changed
in the LSB after the mathematical divisions were moved around.
