Free mimimal GenZH compatible package

[GoodGh0st]

I think as ZH now open, it would be nice if we have package that we can redistribute and modify without DMCA worries. It doesnt need to be fully zh recreation, more like fragglet's miniwad project. Project would be lightweght, have relative implementation of all engine features and overly documented. That way if we will made new features in engine or some madmen decide to make new game it would be easier to iterate against simpler package.