Persist engine state in DAW projects, black monochrome panel, expand preset bank

- Save/load the engine's full parameter set alongside the preset index so
  knob and menu tweaks survive relaunching a song project
- Make the plugin panel black: top/surround laser border and bottom deck
  (rotary + nav keys) are now #000000
- Extend factory bank to 320 categorized presets and add LCD click-to-open
  preset category browser

Source/LcdDisplay.cpp

@@ -236,4 +236,12 @@ void LcdDisplay::paint (juce::Graphics& g)
     }
 }
 
-void LcdDisplay::timerCallback() { repaint(); }
+void LcdDisplay::timerCallback() { repaint(); }
+
+void LcdDisplay::mouseDown (const juce::MouseEvent& e)
+{
+    const int row = juce::jlimit (0, kRows - 1,
+                                  (int) (e.position.y / (float) (getHeight() / kRows)));
+    if (onPressed)
+        onPressed (row);
+}