Remove unnecessary Compound hack on BoundingVolume

Closes #45

Default for hkMatrix3 should be identity.

nifxml_doc was completely rewritten into nifdoc

nifxml has not been cleaned up much yet, though everything was converted to Python 3, and almost everything relevant solely to niflib was moved out of nifxml.py and into gen_niflib, which will reside in the niflib repo.

Removed all the HTML template files and simply use Python string formatting with block strings.

nifxml no longer runs on import, so `parse_xml()` must be called from the calling script.

Removes extraneous comma from default attr list.

Removes assumptions that the parser can handle `cond` checks against an NiObject type from inside of a `compound`.  This required splitting up BSPackedCombinedSharedGeomDataExtra and BSPackedCombinedGeomDataExtra and repeating some of the data.

10.0.1.2 does not have a User Version to check against, so the >= 3 of the condition previously wasn't even catching 10.0.1.2 since the User Version was 0.

Fixes Havok for all files under 10.1.0.0.

nifxml 0.9.  Please read PR message for new features and required parser changes.

The game, Entropia Universe, only used Gamebryo between 2004 and 2009, when it switched to CryEngine 2.  http://www.entropiawiki.com/Info.aspx?chart=VU&name=10.0

Rename LOD levels in BSLODTriShape to match BSMeshLODTriShape.

Made NiMeshModifier abstract.

Named NiGeometryData Group ID, which is never used but is at least known.

Instead of requiring all parsers to special-case the arg passing for BSVertexDesc,  have just adopted the `\` syntax for compound member accessor.

So at least for parsers that do not internalize BSVertexDesc to be `uint64_t` or equivalent to mirror the game,  all you need to do is support `\`.

For C++ this would go from

`Vertex Desc\Vertex Attributes`
to
`vertexDesc.vertexAttributes`

The period syntax was decided against because it is not very visible and `\` is familiar from filepaths / directory trees.

Added NiSequenceData and NiEvaluator for 20.5.0.0+.  In 20.5.0.0 NiSequenceData is an alias for NiControllerSequence.  The XML does not handle this and will defer to parser support.  It does not seem to happen in practice.

For 20.5.0.1,  NiSequenceData is a hybrid of old and new,  pre-NiEvaluator.

For 20.5.0.2+, NiEvaluator replaces NiInterpolator for everything.  Data wise they are almost exactly the same.

Also improved the default values for Blend and BSpline interpolators.

BSPackedCombinedGeomDataExtra is the version of precombined produced by the CK, whereas all vanilla precombined was BSPackedCombinedGeomDataExtra.   The latter is much smaller because it only includes a reference to the geometry.  The CK precombined bakes all geometry into the file.

Combined GeomMaterialData and MaterialData into one compound and changed NiRenderObject and NiGeometry to compensate, since they used the exact same format for material data.  Moved more rows into MaterialData as well which simplified the conditioning/duplication on NiGeometry greatly.

The header conditions did not apply to 20.0.0.4.10 which is apparently present in Steam distributions.  The correct files are 20.0.0.5.11 which is a newer format.

Fixed a condition in NiParticlesData that was accidentally applying to non-Bethesda NIFs.

Aids in proper creation of new blocks by having sound default values.

Also splits Glossiness/Smoothness in BSLightingShaderProperty to have correct defaults and documentation on ranges.  Unknown Float 1 was changed to Rimlight Power as well, and the next line, Backlight Power, relies on its value being FLT_MAX.  So  `Rimlight Power == 0x7F7FFFFF` is used as a `cond` for Backlight Power and this may require the parser to deal with a float to hex comparison.

The type was actually Bounding Volume, with the "unknown int" being the bound type.  This compound already existed in the XML for other blocks.

Missed field when transferring decoding from 010 templates.

With gen_niflib supporting the prefix attribute, enums can be shifted to using it where needed.  In this case the name attributes of the bitflags take up a lot of space in the UI and removing the prefix compacts this.

Also made them more consistent.  FO3 is now  F3SF1/F3SF2 and FO4 is F4SF1/F4SF2.

Also flattened the hardcoded entity arrays since there has to be two anyway.  This way changing the Num to incorrect number will not mess up the file writes.

Reduced the 3 sets of Transform A and B rows to only two by changing the vercond.

Narrow and correct the template types used for refs where possible.

Give correct inheritance to shader properties for Skyrim and later.

Oblivion appears to use TransformA and TransformB just like FO3 and later but the orders of the vectors appear to be swapped for each transform.  At least this makes the constraints render consistent with FO3+.

The mapping will now be done in nifdocsys.

Changed to be more in line with the real names.  Combined the FO4 BSGeometrySegmentData with the old BSGeometrySegmentData in the same compound so that they would be the same type/variable for niflib on BSSubIndexTriShape and removed the suffix attr for it.

Use BSVertexDesc everywhere applicable.  Now passing in the entire compound as an ARG.  This means that a parser either has to treat BSVertexDesc as a uint64 and then shift to VF6-VF7, use & overloads for the class, or special case the class in some way.

Changed BS Properties fixed-size link array to two flat Refs as they are always a Shader Property and an Alpha Property and are dealt with flatly in-engine as well.

nifdocsys will cast duplicate names as long as the types are integral and the largest type is first.

"Signed" turned into `signed` which is a reserved keyword in C++.  A ref was missing a template.

Also some decoding and major corrections.

NiParticlesData and NiPSysData were almost completely wrong.  NiGeometryData was wrong.  NiGeometry was wrong.  This was mostly due to Bethesda changing or breaking inheritance for derived types.

For Bethesda 20.2 NIFs NiParticlesData now inherits from NiObject directly.  NiParticleSystem changes between BSGeometry or NiGeometry based on version.

This resulted in NiPSysData and NiParticleSystem being almost completely wrong for later Bethesda versions.

Also changed all misuses of `User Version` to differentiate Bethesda versions to `User Version 2`.

Removal of extraneous or inaccurate "Unknown" descriptions,  removal of unhelpful, repetitive and unnecessary descriptions.  Clarification of many descriptions.  Clarification of some names.  Focus on more useful descriptions for particle system blocks.

Prefix actual Havok lib types with 'hk', remove 'hk' from TriangleData as it is a Bethesda type.