There were 16 changed shader flags between game versions.  This creates
a new set of enums for FO4 so that the proper descriptions can be shown
for the bits.

Also, the original vercond for Shader Flags 1/2 was unnecessary.  The
Skyrim NIFs that are User Version == 11 are actually structured like FO3
NIFs and use different shader blocks.  So changing the condition like I
did is a sound change, and I've already scanned all vanilla Skyrim NIFs.

Also changed inheritance for bhkNPCollisionObject because the Flags are
different now.  Also bhk*System aren't actually extra data so I changed
the inheritance there.

Names were again changed to mimic what they are called in the engine.
Some previously unknowns were clarified as well.

Changed to match the names found in the engine.

After changes to NifSkope parsing there is no longer a huge benefit to
bypassing all the cond="" / ARG checking on the BSVertexData.  The other
programs did not have this issue, so the variants can be removed.

Combined VF6 and VF7, created <bitflags> after rigorous testing.
Rigorous catch-all compound instead of the mess before.  Removed edge
case compounds as they are no longer needed.   Left optimized compounds
for NifSkope speed issues.

PyFFI does not like missing template attributes for Ref/Ptr despite the
documentation saying the attribute is optional.

Validation for "Skin" on BSTriShape is set only to NiObject for the time
being.  Setting it to BSSkin::Instance would require moving around the
blocks.

Correct data length in all cases, but not decoded.

Supports several edge cases at the cost of being more complicated since
the XML is not set up to allow testing of multiple flags in compounds.

Now loads SCOL with crashing NifSkope and without any errors.  The
PreCombined folder now at least opens but with errors as
BSPackedCombinedSharedGeomDataExtra is not decoded.

Much wider support of meshes overall, without any NaN issues stemming
from misassignment of half float types.

Very little actually changed, just the addition of 3 textures + env map
scale.

Not positive about the Scale but it seems likely.

Running XML Checker on 755 armors went from 75s to 9s.  There is
definitely a problem with ARG speed that needs to be fixed.

Removed outdated comment, added Fallout 4 to version nums.

Affects mostly particle/FX NIFs which can't really be edited anyway.

Add zero option to ExtraVectorsFlags to allow blender plugin to set the

value during export.

bhkBreakableConstraint update

1. Added PrismaticConstraint to list of available constraints in SubConstraint
2. Previously added enum "ConstraintType" renamed to "hkConstraintType"

Added structure of bhkBreakableConstraint. It seems that it is (and also bhkMalleableConstraint) some kind of "parent descriptor" for behavior for their "children" constraint which must be inserted within it. This inserted constraint in named "Sub Constraint", its type is determined by "Constraint Type" integer value. After this integer there is inserted complete constraint - one of allowed "common" constraints. And then there are inserted parameters specific for parent constrains (for example breakable one has "Threshold" and "Remove if Broken"). From vanilla nifs it seems that this "Sub Constraint" has always set its "Num Entities" to 2 but also both references to "Entities" are set to None. I think that this is probably because the relation between two rigid bodies this constraint is affecting is determined earlier - in "Entities" of parent constraint (bhkBreakableConstraint or bhkMalleableConstraint) and therefore it is not necessary (or it is forbidden?) to set references to entities also in "Sub Constraint".