Service both VST3 parameter channels, and promote pitch key-track and Trigger length so all 44 ids issue

The SDK's own single-component sample drains inputParameterChanges in
process() and implements setParamNormalized; automation was reading the
GUI channel alone. The audio thread now patches a block it solely owns.

src/shell/instrument/editor_input_waveform.cpp

@@ -119,6 +119,10 @@ bool ReaSamplerEditor::mouseDownWaveform(const FaceLayout& fl, int x, int y) {
                 dragStartEnv_ = env;
                 dragSampleFrames_ = frames;
                 dragStartParams_ = params_;
+                // Peer of mouseDownDeck's bracket. LATCHING with no id named, because a node or
+                // knot drag can move more than one exposed parameter and the grab cannot know
+                // which; the release and capture-lost paths close it generically.
+                if (processor_) processor_->beginParamGestureLatch();
                 return true;  // node moves once the cursor drags
             }
             return splineOverlayClick(overlay, x, y, gesture, /*addOnEmptySpace=*/false);