Re-add kwin and hyprland helper to get window title, this time without a thread

include/DesktopEnvironment/DesktopEnvironment.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+
+namespace gsr {
+    class DesktopEnvironment {
+    public:
+        DesktopEnvironment() = default;
+        DesktopEnvironment(const DesktopEnvironment&) = delete;
+        DesktopEnvironment& operator=(const DesktopEnvironment&) = delete;
+        virtual ~DesktopEnvironment() = default;
+
+        virtual bool start() = 0;
+        virtual void update() = 0;
+        // Return an empty string if none
+        virtual std::string get_focused_window_title() = 0;
+        // Return an empty string if unknown
+        //virtual std::string get_focused_monitor_name() = 0;
+    };
+}