Gen extend standard library

[GalaxianMonster]

The gen standard library is a bit small since it only has limited features.
I think it will be good for it to have file I/O.
You should also store file I/O functions in a "file" global map.

That's all.

[bichanna]

I'll try it someday when map and array become stable.

[GalaxianMonster]

Ok thanks.