With this, autoloading upon launching the game should be fully working.
Also added some randomness to the pitch of step_sfx to make them sound a
bit less repetitive, and made it so the game can only save if the
current scene is a Scene_Map (because auto_saving at the titlescreen
breaks things pretty badly).
Updated default save and load file functions to save and load the extra
data that oneshot saves (followers and fast travel). Also updated the
default save/load and the new save/load to save the footstep_sfx array,
since otherwise maps have no footstep sfx after loading a save until you
change map.
