Steam Cloud Support

[multimeric]

Hi,

Since this has a Steam release, I'm wondering if you could support Steam Cloud saving. I was going to suggest using the Steam Cloud API to implement this (and I would be happy to write a PR), but it seems like it would be easier to use the Auto-Cloud option which doesn't actually require any code.

[stalkerg]

ok, looks like it's easy to implement, I will try soon