Rebrand 'map object' and 'field object' to 'event object'

include/load_save.h

@@ -22,8 +22,8 @@ void sub_8076D5C(void);
 void sav2_gender2_inplace_and_xFE(void);
 void SavePlayerParty(void);
 void LoadPlayerParty(void);
-void SaveMapObjects(void);
-void LoadMapObjects(void);
+void SaveEventObjects(void);
+void LoadEventObjects(void);
 void SaveSerializedGame(void);
 void LoadSerializedGame(void);
 void LoadPlayerBag(void);