adapted to new update/render interface; added fading-rects module

huey/Huey.cpp

@@ -18,7 +18,8 @@ class Huey : public ScreensaverPlugin {
         ~Huey() = default;
 
         int fps() const override;
-        void draw_frame() override;
+        void update() override;
+        void render() override;
 
     private:
         double _hue {0};
@@ -32,7 +33,11 @@ int Huey::fps() const {
     return 5;
 }
 
-void Huey::draw_frame() {
+void Huey::update() {
+
+}
+
+void Huey::render() {
     // next color
     HSB hsb;
     hsb.h = _hue;