This reapplies a change from 7988a5cd,
which was accidently reverted in 4a8c4c5a.

BSLightingShaderProperty: remove unknown parameters from API (need to add these back with actual names from nifxml); warn about unknown API.

BSLightingShaderProperty: Unknown Float Set 5 -> Sparkle Parameters (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

BSLightingShaderProperty: Environment Map Strength -> Environment Map Scale (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

BSLightingShaderProperty: Unknown Int 7 -> Texture Clamp Mode (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

Emissive Saturation -> Emissive Multiple (see nifxml commit eb44a85334c1e3f89522de62f8fd14549f74c47d).

Todo: refactor removed code into a dedicated function which copies unknowns from another block?

fixed niflib to exporter geometry data with binormals and tangets in it but broke niflib a bit. WARNING! from now on niflib will cause bugs when regenerated because of this

added support to read the nif header separately. seems logical to see ahead what kind of file do we have

made changes to the complexshape to support dismember partitions. still need to add support for merging with dismember partitions

started adding support for BSDismemberSkinInstance.h in the complex shape. so far nothing is functional but at first glance it seems pretty straightforward enough

added support to read the nif header without reading the entire file. useful to check what kind of importer should be used to read the file.