Extract RenderTexture from Canvas

For easyer managment of texures and potential buffers

inc/App.hpp

@@ -1,4 +1,4 @@
-#include <vector>
+#include <array>
 #include "canvas/Canvas.hpp"
 
 class App
@@ -15,7 +15,8 @@ public:
 private:
   int pos = 0;
   int screenWidth, screenHeight;
-  std::vector<Canvas> canvases;
+  Canvas canvas;
+  std::array< RenderTexture2D, 2> canvasTexure = { 0 };
   float rotation = 0.0f;
   Rectangle destB;
   Rectangle destA;