FR: Add math modules as devices to the modular view

[masterjoe]

Currently it is not easily possible to offset, scale, transform data values - especially modulation data - in the data flow of the modular view.

I would love to see several math modules added which transform data that goes through them using mathematical rules.

The following new devices come to my mind to transform values:
- add (add two input values to produce a new value)
- substract (two inputs, one output)
- multiply (two inputs, one output)
- devide (two inputs, one output)
- invert (one input, one output)
- quantize (one input, one output)
- interpolate (use a definable buffer to smooth out values; one input, one output)
- ...

With these additional devices / modules you could transform:
- audio data
- modulation data
- controller data

Would be very useful!