Saving and Loading

Saving

TODO: Write in more detail essentially, when the game is "saved", all nodes in the groups "savegame_entity", "savegame_gameinfo", and "savegame_other" will have the function save() -> Dictionary called on it, and it expects a dictionary of arbitrary data in return.

Loading

TODO: Write in more detail All entities present in the save file will have load_data(data:Dictionary) -> void called on it, passing in the previously saved data. The Gameinfo and Other areas are unused at the moment, but they will be given their info later. see issue