Pyffi

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* nif and cgf documentation improved

* added a number of new doctests

* nif: new scripts

- niftoaster.py for testing and modifying NIF files (contributed by wz)

- nifvisualizer.py for visualizing nif blocks (contributed by wz)

- nifmakehsl.py for making hex workshop structure libraries for all nif
versions

* nif: bundling NifVis and NifTester modules so you can make your own nif
toasters and visualizers

* nif: fixed rare issue with skin partition calculation

* cgf: new script

- cgftoaster.py for testing and modifying cgf files (similar to niftoaster.py)

* cgf: bundling CgfTester module so you can make your own cgf toasters

* cgf: various xml bugs fixed

* cgf: write support improved (but not entirely functional yet)

* cgf: material chunk custom function for extraction material shader and script

* Expression.py: support for empty string check in condition

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* issue warning message instead of raising exception for improper rotation
matrix in setScaleRotationTranslation

* fixed skin partition bug during merge

* skin partition bone index padding and sorting for Freedom Force vs. the 3rd
Reich

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* added mopp parser and simple mopp generator

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* fixed bug that occurred if userver = 0 in the xml (fixes geometry morph data
in NIF versions 20.0.0.4 and up)

* NIF:

- tree() function has been extended

- some minor cleanups and more documentation

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* kwargs for getRefs

* NIF:

- fixed bug in skin partition calculation

- when writing NIF files the refs are written in sequence (instead of the
links, so missing links will yield an exception, which is a good thing)

- new functions to get list of extra data blocks and to add effect

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* NIF:

- new function to add collision geometries to packed tristripsshape

- fixed bug in bhkListShape.addShape