helpers: Add new C++ Signal and Listener classes

A memory-safe alternative to wl_signal

src/helpers/signal/Signal.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <functional>
+#include <any>
+#include <vector>
+#include <memory>
+
+#include "Listener.hpp"
+
+class CSignal {
+  public:
+    void emit(std::any data);
+
+    //
+    [[nodiscard("Listener is unregistered when the ptr is lost")]] CHyprSignalListener registerListener(std::function<void(std::any)> handler);
+
+  private:
+    std::vector<std::weak_ptr<CSignalListener>> m_vListeners;
+};