add 'region' image property

src/graphics/ui/elements/Image.hpp

@@ -1,11 +1,13 @@
 #pragma once
 
 #include "UINode.hpp"
+#include "maths/UVRegion.hpp"
 
 namespace gui {
     class Image : public UINode {
     protected:
         std::string texture;
+        UVRegion region {};
         bool autoresize = false;
     public:
         Image(GUI& gui, std::string texture, glm::vec2 size=glm::vec2(32,32));
@@ -16,5 +18,6 @@ namespace gui {
         virtual bool isAutoResize() const;
         virtual const std::string& getTexture() const;
         virtual void setTexture(const std::string& name);
+        void setRegion(const UVRegion& region);
     };
 }