MVD Demos Special Characters Problem

[Xylemon]

https://sourceforge.net/p/fteqw/tickets/43/

cyb3rd wrote on 2017-03-22:

MVD demos created with special characters like ">" in it's names, cannot be downloaded to Windows users!

[Xylemon]

@eukara told me of an idea that we'll give the user an option to save the demo with a different name if filename conflicts occur. This would also solve #109