Blender Git Loki

Cleanup: Remove unused render settings

Debug pass type is a residue from the original debug passes support
in Cycles. It got re-implemented using runtime passes registration.

Start resolution was used by Cycles ands Blender Internal. Cycles
calculates it automatically, and Blender Internal is no longer with
us. Render engines which still needs such option can register it as
a custom property.

Differential Revision: https://developer.blender.org/D12280