Fix #2071: cancelScheduledValues with setValueCurveAtTime

[rtoy]

If the cancelTime overlaps the setValueCurveAtTime event, remove the
event too.

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[rtoy]

This is blocked on #2107

[rtoy]

#2107 is fixed now and merging the changes fixes the build error.

[hoch]

This makes sense, but what will happen to the computed value after the cancellation?

[rtoy]

I explicitly left that undefined because we don't say what happens if you cancel events that are currently running. If we want to define that, then that's a different issue.

But a quick test with Chrome shows that if a linear ramp is already running and then cancel events between current time and end of the ramp, then Chrome holds the ramp value at the cancel time. (If the ramp hasn't started, then the output is different.)

[padenot]

I explicitly left that undefined because we don't say what happens if you cancel events that are currently running. If we want to define that, then that's a different issue.

It would be best to fix that.