Siblance plugin

[Trebor]

Desibilator and Paul-L’s De-esser are essentially the same plugin.

@Trebor

This ‘desibilator’ plugin is Paul Licameli’s ‘DeEsser.NY’ just with different default-settings, different slider-ranges, & has tips added to the UI.

Previously the default frequency-range was not wide enough: it stopped at 8kHz, (now 13kHz).
Previously the “number of bands” slider went up to 1000 , when <5 bands is generally sufficient, and >50 will freeze/crash Audcaity.

Updated De-Clicker and new De-esser for speech - #199 by Trebor #