[Feature] browse filebase levels, mods, and skins within olx

[albertz]

Converted from SourceForge issue 2138906, submitted by abyssyncyst

This would probably be a bit of work, but what if there were a feature within lierox to browse filebase levels, mods, and skins, where there is a list and each one you click it gives a preview and you choose whether to save. I see this as a lower priority than many gameplay related feature requests, but something that would be cool to give the game a more professional finish eventually.