Increase number of outputs for Multi-Out version

[kinwie]

Since we follow sfz rule, output paths are counted as stereo pair.
Sfizz currently has 16 outputs (mono), thus just 8 stereo outputs. Will be enough if we can have 16 stereo outs (32 mono).

Most use cases are for splitting drum mics outputs or drum kit-pieces, also percussion kits within single sfz file. They are often more than 8 microphones.
Possibly drum machine kit has more than 8 kit-pieces too.

[paulfd]

Hi @kinwie ! There's the matter of how we show so many outputs on the UI, along with the way our UI is built, that makes this slightly complicated. The core library handles this regardless, but we might also add some checks whether outputs are actually used to reduce computational load.

[redtide]

I was told by one of Calfbox developers that they have no limits in outputs number, which are set from the sfz file (and cannot be changed once loaded).
I like the idea that outputs should not have a fixed number and UI might display as much are requested.