Chams: working alpha via RenderView blend and a custom VMT

Testing on :99 showed the material $alpha path is a dead end: UnlitGeneric
takes translucency from the base texture/vertex alpha, and the debug materials
have neither. Follow Amalgam: apply alpha with IVRenderView::SetBlend
(VEngineRenderView014 slot 4) around the model draw, saving/restoring it.

To have something translucent to blend, write a tiny UnlitGeneric VMT with
$model 1 + $translucent 1 + a white base texture to
<game>/<mod>/materials/hl2hake/translucent.vmt (plus a custom/ copy). It is
written by a preload constructor so it exists before the material system scans
its search paths, then loaded once with FindMaterial. Styles 0/3/4/6 use it
when the colour alpha is below 255.

Also:
- Visible wireframe + through-wall: fill the visible silhouette first so the
  through-wall pass cannot show in the wireframe gaps, then draw a brightened
  contour. Style 6 is now "Solid + contour" (recolour + visible edges).
- find_modules builds local snapshots and publishes them under a mutex; the
  setup thread and the server retry could reset the shared vectors live and
  crash at startup.

Verified on :99: Solid + alpha 64 renders a see-through viewmodel, Solid +
contour shows a blue fill with bright blue contours, Additive is a translucent
coloured glow and Fullbright is a white additive glow.

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