Add Script Cmd for Forcing Save Game (#6090)

Co-authored-by: ghoulslash <pokevoyager0@gmail.com>

asm/macros/event.inc

@@ -2471,6 +2471,11 @@
 	callnative Script_SetDifficulty, requests_effects=1
 	.byte \difficulty
 	.endm
+    
+	.macro forcesave
+	callnative Script_ForceSaveGame
+	waitstate
+	.endm
 
 	@ Makes the trainer unable to see the player if executed.
 	@ This is a no-op if the player interacts with the trainer.

src/start_menu.c

@@ -1497,3 +1497,11 @@ static bool8 StartMenuDexNavCallback(void)
     CreateTask(Task_OpenDexNavFromStartMenu, 0);
     return TRUE;
 }
+
+void Script_ForceSaveGame(struct ScriptContext *ctx)
+{
+    SaveGame();
+    ShowSaveInfoWindow();
+    gMenuCallback = SaveCallback;
+    sSaveDialogCallback = SaveSavingMessageCallback;
+}