Minor - Adds target FPS control to engine settings - V14.5.0

Adds functionality to control the target FPS of the engine via the ImGui settings panel.

This includes:
- Adding target FPS variables and accessors in the application class.
- Adding a set_target_fps function to the fps_limiter class.
- Updating the ImGui engine settings panel to include a target FPS setting.
- Modifying the main loop to make use of the fps limiter and the engine target FPS.

enginecustom/src/inc/system/fps_limiter.h

@@ -3,11 +3,9 @@
 
 class fps_limiter {
 public:
-
     /**
-     * Builder for fps_limiter class
-     * This class is used to limit the execution rate of a loop based on a target frames per second (FPS).
-     * @param target_fps Target frames per second for the limiter. The default is 60.0f FPS.
+     * Constructor for fps_limiter class
+     * @param target_fps Target frames per second for the limiter. Default is 60.0f FPS.
      */
     explicit fps_limiter(const float target_fps = 60.0f)
         : min_delta_(1.0f / target_fps), last_time_(std::chrono::high_resolution_clock::now()) {}
@@ -25,7 +23,17 @@ public:
         return false;
     }
 
+    /**
+     * Dynamically set the target FPS limit.
+     * @param target_fps New target frames per second.
+     */
+    void set_target_fps(float target_fps) {
+        if (target_fps > 0.0f) {
+            min_delta_ = 1.0f / target_fps;
+        }
+    }
+
 private:
-    float min_delta_;
-    std::chrono::high_resolution_clock::time_point last_time_;
-};
+    float min_delta_;  // Minimum time in seconds between frames
+    std::chrono::high_resolution_clock::time_point last_time_;  // Time point of last allowed execution
+};