[Mod] Stained Glass and One Way Windows [abriglass]

[stefapi]

Hi all,
i've posted on https://github.com/Ezhh/abriglass a new pull request which adds new kind of oneway blocks with one, two or three plain sides, new materials and an optional dependancy on ethereal

The complete mod is here: https://github.com/stefapi/abriglass

hope this will interest someone !