Simplify handling effect output for spatial effects

Effects are given a 3D ambisonic buffer of the same order as the device, for
processing surround sound. Effects that pass input channels to matching output
channels as it processes them don't need to mix each input channel to all
output channels.

At most, an input channel may mix to a different output channel, if the target
buffer uses a different channel layout, and need a gain adjustment, if it uses
a different scaling. With a 2D output buffer, a number of channels can be
skipped altogether.

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