[gmpi] ramps vs audio-rate controls

It was asked to me this week (by someone who may or may not turn up here)
why we're spending time on ramped controls, instead of just providing audio
rate controls.

It seems that audio-rate controls for float/real values *might* be a good
answer.  We could either provide point-value and audio-rate controls, or
require all float controls to be audio-rate.

Pros:
        Same end result as ramps
        More flexible than ramps
        No issues with long-running ramps beyond a buffer

Cons:
        Memory bandwidth
        Host needs to enable hooking up point-value controls to audio-rate
          controls

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