Enforce that niflib must use a completely native type for BSVertexData using NifStream istream/ostream overloads.  See:  https://github.com/niftools/nifdocsys/pull/6#issuecomment-311345131

Updates for niflib.  Implemented a prefix and suffix attribute in the XML spec to allow gen_niflib.py to deal with name uniqueness issues for enums and `<add>` names.

Closes #63 Closes #64

This reverts commit 9eb4c2ac.

Split BSVertexData/BSVertexDataSSE back up because of issues with NifSkope's condition caching.  Use niflibtype to redirect BSVertexDataSSE to BSVertexData.

Implementation of proposal in #64.

Adopted proposal from #63.  Only the enums with collisions will be updated for this PR.

Also updated definitions for Eye Data (missed during decoding from #58)

Correct Fallout3Layer to remove enum values from BIPED_PART enum and to fix duplicate definition issues for FOL_BIPED.

Removed BIPED_PART enum values from end of Fallout3Layer.  These are actually a different enum for the next byte (Flags and Part Number).  Max layers is 64 so we know this to be a mistake.  There were also no usages of Fallout3Layer in FO3/NV above FOL_NULL (43).

Renamed value 29 to be more accurate.

Override Segment

"Anim Note Arrays" size is "Num Anim Note Arrays" ???

Override of enumerators

Override of enumerators

Incorrect compile with gen_niflib.py

Redefinition value="8"

Changes meant for inclusion in #58.  Closes #52

Miscellaneous Changes

Merge decoding.  Closes #39 

Remove leading zeroes and add name prefix.

Niflib requires enum names be unique or it simply can't compile.   Until
a system is in place to compensate for this #26 needs to have these
changes reverted.

Picked from #39

For a couple Oblivion NIFs which are pre-Havok version yet somehow use Havok..

Removed compounds:  bhkRDTConstraint, bhkRDTMalleableConstraint.

Renamed compound: SubConstraint->ConstraintData (to reflect hkpConstraintData*)

Created:  MalleableDescriptor (to reflect other Descriptor compounds)

Corrected bhkRagdollTemplate inheritance.  Fully decoded bhkRagdollTemplateData.

bhkRDT now load without error or link validation warnings.

This was necessary so that Fallout3HavokMaterial actually applied to all FO3 NIF versions (e.g. User Version 2 == 16)

Pull in some of the documentation from #39 and fix the type names and the bone transform layout.

Seems niflib wants that row to be a special type, so fix "InertiaMatrix" to be the real type, `hkMatrix3` and use it for the Inertia Tensor.

Changes to:
- BallAndSocketDescriptor
- Renamed PivotAB to ConstraintInfo
- bhkBallSocketConstraintChain
- bhkPoseArray

Split BSVertexData into two versions, one for FO4 and one for SSE.  This
uncomplicates some of the conditions and lowers the row count for each
vertex compound so will be faster to parse.

Also some misc name/type changes for FO4 blocks.