Merge remote-tracking branch 'origin/gi' into large-worlds

# Conflicts:
#	Source/Engine/Graphics/PostProcessSettings.cpp
#	Source/Engine/Level/Actors/SkyLight.cpp
#	Source/Engine/Renderer/GBufferPass.cpp
#	Source/Engine/Renderer/GI/GlobalSurfaceAtlasPass.cpp
#	Source/Engine/Renderer/GlobalSignDistanceFieldPass.cpp
#	Source/Engine/Renderer/GlobalSignDistanceFieldPass.h
#	Source/Engine/Renderer/RenderList.h

Source/Engine/Renderer/DrawCall.h

@@ -35,6 +35,11 @@ class ISkyRenderer
 {
 public:
 
+    /// <summary>
+    /// Returns true if sky is realtime, otherwise it's static.
+    /// </summary>
+    virtual bool IsDynamicSky() const = 0;
+
     /// <summary>
     /// Apply sky material/shader state to the GPU pipeline with custom parameters set (render to GBuffer).
     /// </summary>