This fixes problems with the savegame sent by K風鈴 (negima.0824@)
It doesn't load in RPG_RT but looks like a RPG_RT savegame. No idea what happened, the pending field has a strange size. Also the Actor IDs are wrong.
reader_struct realigns now the read pointer when the size is incorrect and shows an error message on the console when this happens.
Overwrite the ID of the actor with our ID because a bug reported had …
…a save game with invalid IDs values, no idea how this happened.
Make reader_struct more error tolerant by realigning the read pointer…
… instead of generating an assert when a Primitive type has the wrong size. A reported save game has a strange size of 4 for "pending". (See #174)