Added dialogs for saving/loading maps directly, work on web support

core/assets/bundles/bundle.properties

@@ -164,6 +164,8 @@ text.editor.generate=Generate
 text.editor.resize=Resize
 text.editor.loadmap=Load Map
 text.editor.savemap=Save Map
+text.editor.importmap=Import Map
+text.editor.exportmap=Export Map
 text.editor.loadimage=Import Terrain
 text.editor.saveimage=Export Terrain
 text.editor.unsaved=[scarlet]You have unsaved changes![]\nAre you sure you want to exit?