Fix up the backend so it has sane names like get_sprite and get_icon, then implemented a guecs::Icon for icons. Those don't scale and typically have other properties different from a Sprite.

include/guecs/sfml/backend.hpp

@@ -9,10 +9,11 @@ namespace sfml {
   public:
 
     Backend();
-    guecs::SpriteTexture texture_get(const string& name);
+    guecs::SpriteTexture get_sprite(const string& name);
+    guecs::SpriteTexture get_icon(const string& name);
     void sound_play(const string& name);
     void sound_stop(const string& name);
-    std::shared_ptr<sf::Shader> shader_get(const std::string& name);
+    std::shared_ptr<sf::Shader> get_shader(const std::string& name);
     bool shader_updated();
     guecs::Theme theme();
   };

include/guecs/sfml/components.hpp

@@ -38,12 +38,16 @@ namespace guecs {
   };
 
   struct Sprite {
-    // either you set a filename here,
-    // or some kind of config,
-    // or a callback that does the loading,
-    // or a virtual function and you subclass
-    // or there's a static config function you call once,
-    // that's passed an object with all the necessary gear
+    string name;
+    int padding = THEME.PADDING;
+    std::shared_ptr<sf::Sprite> sprite = nullptr;
+
+    void init(lel::Cell &cell);
+    void update(const string& new_name);
+    void render(sf::RenderWindow& window, sf::Shader *shader_ptr);
+  };
+
+  struct Icon {
     string name;
     int padding = THEME.PADDING;
     std::shared_ptr<sf::Sprite> sprite = nullptr;

include/guecs/sfml/textures.hpp

@@ -11,6 +11,7 @@ namespace textures {
   struct SpriteTexture {
     std::shared_ptr<sf::Sprite> sprite = nullptr;
     std::shared_ptr<sf::Texture> texture = nullptr;
+    sf::Vector2i frame_size;
   };
 
   struct TextureManager {