Filenames may not contain spaces

[rgrieder]

To avoid problems when working in a console, no filename should contain spaces (and forward slashes for that matter).

Please check the files in the data folder for filenames with spaces (like "The Time Machine" && "Fight in our Back") and change them. With the new LevelInfo class, we don't even loose the pretty print for level names.

[scheusso]

maybe we should think about a naming convention (e.g. camelcase "FightInOurBack" or with underscores "Fight_in_our_Back") for different data file types before we do this.

[dafrick]

I agree, the thought had crossed my mind, too. I would go for CamelCase, because that's how the majority of our files in the data directory are named. I'll try to update the hopelessly outdated Content Creation Guide to making levels this weekend, then we could put the new naming in there, as well.