Fix power gen fan sound

* Stop fan sound when switching sector
* Start fan sound when loading a save where current sector is power gen sector

Strategic/Ja25 Strategic Ai.cpp

@@ -1247,7 +1247,6 @@ BOOLEAN LoadJa25SaveInfoFromSavedGame( HWFILE hFile )
 	//	}
 //	}
 
-	gJa25SaveStruct.iPowerGenFanPositionSndID = -1;
 
 	return( TRUE );
 }

Strategic/strategicmap.cpp

@@ -2996,6 +2996,15 @@ BOOLEAN EnterSector( INT16 sSectorX, INT16 sSectorY, INT8 bSectorZ )
 
 #ifdef JA2UB
 	//Ja25 No meanwhiles
+	// But DO check if powergen fan sound needs to be restarted
+	extern UINT32  SECTOR_FAN_X;
+	extern UINT32  SECTOR_FAN_Y;
+	extern UINT32  SECTOR_FAN_Z;
+
+	if (gWorldSectorX == SECTOR_FAN_X && gWorldSectorY == SECTOR_FAN_Y && gbWorldSectorZ == SECTOR_FAN_Z)
+	{
+		HandlePowerGenFanSoundModification();
+	}
 #else
 	if ( AreInMeanwhile( ) == FALSE )
 #endif

TileEngine/worlddef.cpp

@@ -3420,7 +3420,10 @@ void TrashWorld( void )
 	//Remove the schedules
 	DestroyAllSchedules();
 #ifdef JA2UB
-//Ja25 no meanwhiles
+	//Ja25 no meanwhiles
+	// But DO turn off powergen fan sound
+	extern void HandleRemovingPowerGenFanSound();
+	HandleRemovingPowerGenFanSound();
 #else
 	// on trash world sheck if we have to set up the first meanwhile
 	HandleFirstMeanWhileSetUpWithTrashWorld( );