[GEN] Backport collision test related changes and fixes in WWMath from Zero Hour

[xezon]

Merge with Rebase

• Follow up for [CMAKE][CORE] Move WWSaveLoad and most of WWMath to Core #694

This change unifies the remaining code of WWMath.

Generals inherits the following changes:

• cardinalspline : Optimizes code in CardinalSpline3DClass::Update_Tangents
• colmathaabox : Fixes normal direction in CollisionMath::Collide for AABox-AABox collision
• colmathaabtri : Refactors the origin of the CollisionContext normal in aabtri_compute_contact_normal function
• colmathobbobb : Fixes float division by zero in obb_separation_test function
• colmathobbtri : Refactors storage type in obbtri_compute_contact_normal function
• colmathobbtri : Changes normal value calculation in CollisionMath::Collide for OBBox-Tri collision

As far as I could tell, the collision math changes in colmathaabox, colmathaabtri, colmathobbtri are never called in Zero Hour (should have checked Generals but it is probably the same). So these math changes are probably inconsequential. If there were actual game logic relevant collisions using this code, it could incur behaviour changes.

Regarding CollisionContext, there appears to be a relevant comment nearby:

** Note that much of the code needs the un-normalized triangle normal.  For this reason,
** I have to compute N rather than copying it from the triangle.  (commenting this to
** avoid re-generating a difficult to find bug that I had)

The math changes are split into separate commits to make testing of older changes easier if we ever wanted to revisit a particular change.

[roossienb]

Checked that

• colmathaabtri.cpp, colmathobbob.cpp and colmathobbtri.cpp are not used in Generals
• CardinalSpline3DClass::Update_Tangents() is never used.
• CollisionMath::Collide() in colmathaabox.cpp is never used.
• Tested it against the Skirmish 1 replay and had no issues.

Changes in this PR have no effect on Generals and can be safely merged.