figments: input: add pointer type to variant, and new config update event

lib/Figments/Input.h

@@ -13,6 +13,7 @@ struct Variant {
         Integer,
         String,
         Color,
+        Pointer,
     };
 
     Variant(int v)
@@ -24,6 +25,9 @@ struct Variant {
     Variant(const CRGB &v)
       : type(Color), m_value{.asRGB={v.r, v.g, v.b}} {}
 
+    Variant(void* p)
+      : type(Pointer), m_value{.asPointer=p} {}
+
     Variant()
       : type(Null) {}
 
@@ -33,12 +37,16 @@ struct Variant {
     CRGB asRGB() const;
     int asInt() const;
     bool asBool() const;
+    template<typename T> T* as() const {
+        return (T*)m_value.asPointer;
+    }
 
 private:
     union {
         int asInt;
         const char* asString;
         uint8_t asRGB[3];
+        void* asPointer;
     } m_value;
 };
 
@@ -88,6 +96,7 @@ struct InputEvent: public Variant {
         LoadConfigurationByName,
         SetColor,
         SaveConfigurationRequest,
+        ConfigurationChanged,
 
         // Firmware events
         FirmwareUpdate,
@@ -166,6 +175,17 @@ private:
     std::function<InputEvent(const InputEvent)> m_func;
 };
 
+class ConfigTaskMixin : public virtual Loopable {
+  public:
+    void handleEvent(const InputEvent &evt) override {
+      if (evt.intent == InputEvent::ConfigurationChanged) {
+          handleConfigChange(evt);
+      }
+    }
+
+    virtual void handleConfigChange(const InputEvent& evt) {}
+};
+
 class OnlineTaskMixin : public virtual Loopable {
   public:
     void handleEvent(const InputEvent &evt) override {