Patch - Improves code and UI for better engine stability - V14.5.30

Addresses minor issues across the engine to improve stability and UI.

- Updates ImGui window size for better rendering
- Adds macro for boolean returns (R_TRUE and R_FALSE)
- Adds missing includes and removes unused code
- Updates shader code to use the new macros and improve readability

enginecustom/src/inc/system/ecs/systems/render_system.h

@@ -53,7 +53,7 @@ public:
         auto shader = entity->GetComponent<ShaderComponent>();
 
         if (!transform || !render || !shader || !render->GetModel())
-            return false;
+            R_FALSE
 
         // Calculer la matrice monde
         XMMATRIX scaleMatrix = transform->GetScaleMatrix();