shift capturing from a globalMacro to a sceneRenderstate S32

lets us ditch shader recompilation so that can be done on the fly without hitches, though does cost us a per-shader const for objects and postfx

Engine/source/shaderGen/shaderGenVars.h

@@ -86,6 +86,8 @@ struct ShaderGenVars
    const static String vectorLightColor;
    const static String vectorLightBrightness;
 
+   const static String isCapturing;
+
    const static String ormConfig;
    const static String roughness;
    const static String metalness;