Blender Git Loki

Doversion: Set Clay when opening "Blender Render" engine scenes

We get already enough reports of people complaining about crashes on
edit mode unaware that they are in the non-supported Blender Render
engine.

Blender Render is going away, no reason to keep it around. Once we have
a nice fallback on Eevee and fast file loading we can default to Eevee
instead.