Exported strategyquant file names need to be improved

Export and name the strategy file as trading platform source code, that is very convenient for strategy import and follow-up.


However, there is still a small problem with the export and naming of Multichart source files ( *.pla) . 


1, If only one strategy is selected for export, still use the old naming method. The default name is like "Strategy223341".


Although we can modify the file name, when importing MC, it still shows the original default name.




2, When exporting strategy in batches, we can add the first half and the second half of the file name. It looks like this is exactly what we need. But similar problems exist.  


The changed name does not take effect in MC.


I found that in the pla file, the first name of the file will be recorded in the header. No matter how you rename this file later, MC will only display this file name. So we need to modify the naming method of the strategy.