Rite of Returning 1.2.6

Soul Spear visibility fix:
- The new Soul Spear (2).bbmodel is still copied byte-for-byte and is not modified.
- Fixed custom Soul Spear renderers so they support bbmodel files with no "groups" section.
- The new model had no groups section, which made the renderer fail loading and render nothing.
- Held Soul Spear and thrown projectile now use the same visible rendering path as the working version.
- Exact look-vector throw retained.
- Mob bounce/fall behavior retained.
- Ground-stick exact orientation retained.
- Trident tags retained.
