Nifskope xml and versions

Create article in [Modding Tools](https://morrowind-modding.github.io/modding-tools/)/[3D Modeling Software & Tools](https://morrowind-modding.github.io/modding-tools/3d-modeling-tools/) on NifSkope.

- explain how to change xml file
- compare different nifskope versions and their uses/limitations 