Added IRenderable, removed shader programs and allow more nuanced control of render passes, UI items are now rendered same as other scene item components.

src/dawn/scene/components/ui/UIBorder.hpp

@@ -24,9 +24,7 @@ namespace Dawn {
 
       float_t getContentWidth() override;
       float_t getContentHeight() override;
-      std::vector<struct ShaderPassItem> getPassItems(
-        glm::mat4 proj, glm::mat4 view
-      ) override;
+      std::vector<struct ShaderPassItem> getRenderPasses() override;
       void onStart() override;
   };
 }