Fix for fir_filter and add multiplier object

Semi automated routing, SGTL members renamed & gain/volume set around 1

Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewav...

Square, triangle and sawtooth are generated directly.

Bit of a fight with the github client, heaps of distraction and no time
delayed me getting back to this. Sorry.

While changing everything else I also modified most things regarding
gain or volume from using 0 to 100 (or -100 thru 0 to 100) to using 1
(or -1 to 1) with only one exception I can think of right now in the
autoVolumeControl(..); - I modified all examples I found .volume or
similar in to suit.

I found opportunity to write these changes, I did not have a chance to
test much more extensively than just compiling it. I will have a chance
to test them by about 24 hours time.