saugns v0.5.0b. Fixes for PD parameter handling. Fix sweeps for PD parameters. These were meant to work, but were broken by v0.5.0 refactoring; time flags lacked initialization. Correct polarity of PD `.p` phase offset for `R`, was flipped relative to `W`. Fix mis-scaling of the `.p` phase offset for `.c` and `.d`, when using `R mh`, and for `R` whenever the `.f` multiplier is used. Refactor, unify "phasor" (phase signal generator, including PD) for `W` & `R`.