This moves the renderer options into their own class to:@
- allow one to only include the rendering options, not the whole
renderer header, when one wants access to rendering options.
- centralise rendering changes and their side-effects.
- clean up code.
Tested by: historic_bruno, Freagarach
Commented by: historic_bruno
Differential Revision: https://code.wildfiregames.com/D1929
This was SVN commit r22610.