Mario Editor: add save/load functionality

mario/maploader.cpp

@@ -96,6 +96,10 @@ MapObject parseBlock(std::ifstream &map_file) {
                      modifier_id, modifier_data);
 }
 
+void loadEmptyMap( std::vector<mapColumnType> &objects, size_t editor_width) {
+    objects.resize(editor_width);
+}
+
 // editor loader
 // TODO catch exception in calling functions
 void loadMap(std::shared_ptr<SDLPP::Scene> &scene,
@@ -104,7 +108,7 @@ void loadMap(std::shared_ptr<SDLPP::Scene> &scene,
              bool editor, size_t editor_width) {
     if(!FSLib::exists(file)) {
         // create empty array large enough for initial editor window
-        objects.resize(editor_width);
+        loadEmptyMap(objects, editor_width);
         return;
     }
     auto renderer = scene->getRendererShared();