Chams: fix the flat viewmodel, glow outline and fullbright styles

- Flat uses the solid model shader with the FLAT flag on the viewmodel;
  vgui/white does not draw skinned models and made the hands vanish.
- Glow outline draws its wireframe contour with ZNEARER and a brightened
  colour, so the solid base no longer hides the contour.
- Fullbright is now additive + self-illuminated with the colour lifted toward
  white, so it reads differently from Solid and Additive glow.

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