Mod Matrix does the Clampin'

[baconpaul]

Once we have #766 and #767 fully resolved, the mod matrix can clamp outputs for us rather than us having to sprinkle clamps through every part of the DSP code

[baconpaul]

The way to do this is roughly as follows

in basic-blocks ModMatrix.h you see

        if constexpr (ModMatrix<TR>::supportsCurves)
            {
                auto offs = *(r.source) * sourceViaVal;
                if (r.curveFn)
                    *(r.target) += *(r.depth) * r.depthScale * r.curveFn(offs);
                else
                    *(r.target) += *(r.depth) * r.depthScale * offs;
            }
            else
            {
                *(r.target) += *(r.source) * *(r.depth) * r.depthScale * sourceViaVal;
            }

so right after that add basically an

if constexprt (ModMatrix<TR>::providesTargetlBounds)
  *(r.target) = std::clamp(*(r.target), r.targetMin, r.targetMax)

and add the min and max to that. Then in the VoiceMatrix in scxt set providesTargetBounds to true and set the min and max off the metadata when the target is changed or initialized.