Add BOOST, 3D depth, and gradient-angle knobs

- BOOST: global display level multiplier (0.75 - 2.5, 1.0 default)
- 3D: pseudo-3D bevel/shading on bars, LEDs, peaks and curve (0 = flat)
- G-ANG: 3D gradient angle (-180 - 180, 0 = top-lit)
- Apply CURVING rounded corners to bars and peaks in BAR mode

Source/Analyser.cpp

@@ -105,7 +105,7 @@ void Analyser::computeFFT()
         double norm = (db + tiltDb - minDb) / (maxDb - minDb);
         norm = juce::jlimit (0.0, 1.0, norm);
 
-        targets[b] = static_cast<float> (norm);
+        targets[b] = static_cast<float> (norm * boost);
     }
 }