Quick refactor of the config system to make it easier to refactor config.cpp/hpp later.

shaders.cpp

@@ -33,7 +33,7 @@ namespace shaders {
     if(!INITIALIZED) {
       dbc::check(sf::Shader::isAvailable(), "no shaders?!");
       INITIALIZED = true;
-      Config config("assets/shaders.json");
+      auto config = settings::get("shaders");
       bool good = load_shader("ERROR", config["ERROR"]);
       dbc::check(good, "Failed to load ERROR shader. Look in assets/shaders.json");