Oblivion type nif skeleton.nif IO matching with the exception of the
bhkRagdollConstraint
Version 20.0.0.4-11-11 Nif skeleton import and export. Bones and
collision match, constraints are near perfect match. Still a slight
deviation on twist_b and pivot_b
A more proper fix for bsbound position.
Merge pull request #155 from Ghostwalker71/fix/collision_matrix

Collision matrix IO
Updated setting file path for textures that can not be located due to
being inside compressed library.
version 12-83 nif import with textures
fix for material naming of version 12-83 nif mesh objects, added more
variables to import code.
further progress and clean up for 12-84 nif import and some work on
export
Added Custom values for nif version, user version, and user version 2.
renamed a few variables
Slight redesign of texture import to reduce duplicated code
Reconnect NiTextureProperty using the revised texture import
Created a block in nif_common to convert the nif version Uint hex to
user readable string.
Added version customs, and updated import and export to better handle
current nif files
More cleanup of import and export, Fixed several issues with item type
settings. Unified import and export error classes to nif_utils.NifError
for sanity sake.
Exposed num per vertex in export menu. added BS Num UV Set custom in
niftools.object menu
Clean up after rebase.
Split scale correction for import vs export. updated fliptxt try to 2.70
current API