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_platform.cpp

@@ -120,6 +120,11 @@ void ReaSamplerEditor::attachedToParent() {
 }
 
 void ReaSamplerEditor::removedFromParent() {
+    // The processor outlives this view, so a bracket left open here would leave the host holding
+    // an edit forever and every later internal write to that parameter would emit a bare
+    // performEdit. The capture-lost path normally closes it; this does not rely on Windows
+    // delivering WM_CAPTURECHANGED before the window goes away.
+    if (processor_) processor_->endParamGesture();
     if (childHwnd_) {
         KillTimer(childHwnd_, kSyncTimerId);  // stop the poll before the window goes away
         DestroyWindow(childHwnd_);