refactor: warp everything in Cubed namespace

include/Cubed/texture_manager.hpp

@@ -3,6 +3,8 @@
 #include <Cubed/gameplay/block.hpp>
 #include <Cubed/tools/shader_tools.hpp>
 
+namespace Cubed {
+
 
 class TextureManager {
 private:
@@ -28,4 +30,7 @@ public:
     void need_reload();
     void update();
     
-};
+};
+
+
+}