Omni's Custom Items 1.1.39 - Radiant Omen Voucher Display Fix

- Recentered all voucher geometry on Minecraft's (8, 8, 8) item origin.
- Added mirrored right-hand and left-hand first-person transforms.
- Added centered, front-facing GUI transforms with a small icon margin.
- Added consistent third-person, ground, head, and item-frame transforms.
- Texture UV coordinates and the supplied voucher artwork are unchanged.
