Headlamp

1.3.4

- Rebuild the helmet model to match the new voxel design: a two-layer flared
  brim, five stepped dome tiers with rounded corners, a larger square lamp
  housing with a protruding lens, and a recessed nameplate on each side.
- Replace the armor texture with a new 512x512 texture with edge highlights,
  corner shading and a dark padded underside.
- Move the beam and light origin to the new lens position so the beam still
  leaves the lens. The lens still glows at full brightness when the lamp is on.
- Keep the helmet at the same height on the head, so the face stays uncovered.
- Retain the lighting, shadows and settings from 1.3.3.