Rayview now uses the shader manager.

shaders.hpp

@@ -19,6 +19,7 @@ namespace shaders {
     std::unordered_map<std::string, Record> shaders;
   };
 
+  std::shared_ptr<sf::Shader> get_shared(std::string& name);
   void init();
   bool load_shader(std::string& name, nlohmann::json& settings);
   sf::Shader* get(std::string name);