Rite of Returning 1.2.8

Soul Spear flat-plane tip fix:
- Re-added the flat-plane / zero-area face skipping renderer change.
- Keeps the 1.2.6 groups-loader visibility fix so the spear should not go invisible.
- Keeps Soul Spear (3).bbmodel byte-for-byte and unmodified.
- Applies the renderer fix to both held Soul Spear and thrown Soul Spear projectile.
- Keeps exact look-vector throw, mob bounce/fall behavior, ground stick exact orientation, and trident tags.
