[Enhancement] Have "Export to map files" popup remember last file path

[Thevoododoctor]

When exporting maps to a folder on a regular basis, it would be nice to have ImageToMapMC remember the last file path used. Also, having the program remember the path when restarted would be a plus.

Another idea would be to have the program remember the last used map ID only when the program is open. It could reset once the user exits.

[AgustinSRG]

Thanks for the suggestion! I guess adding that to a config file would be a good solution. Maybe there are other dialogs that would benefit from the same. I'll look into adding this.

[AgustinSRG]

Added in release v1.6.1

[Thevoododoctor]

Thanks! Nice touch having the program increment the map ID by one.

[Thevoododoctor]

Happy new year. I noticed a bug that if the map files are deleted while ImageToMap is open, the program sets the last used map ID to 0.