Using Multirate
New filtering node
Added example using proof-of-concept FilterRender node
Moved Multirate import to the smae file as the FilterRenderer code
Changed code to use new firdes code, added highpass and lowpass
Changed code to use new firdes code, added highpass and lowpass
Including both highpass and lowpass examples
Got rid of debug code from example
Added Resampler node
Added audio filtering example
Changed to WAV filtering example to immediatly transition from normal -> lowpass -> highpass.

Still can't figure out a way to just read a file and switch filters to get a seamless transition between the parts
Better example
Merge branch 'filter_renderer' of https://github.com/JayKickliter/AudioIO.jl
telecom stuff