Merge remote-tracking branch 'origin/master' into 1.9

# Conflicts:
#	Source/Engine/Content/Storage/FlaxStorage.cpp
#	Source/Engine/Renderer/GBufferPass.cpp

Source/Engine/Level/Actor.cpp

@@ -609,7 +609,10 @@ void Actor::SetIsActive(bool value)
 
 void Actor::SetStaticFlags(StaticFlags value)
 {
+    if (_staticFlags == value)
+        return;
     _staticFlags = value;
+    OnStaticFlagsChanged();
 }
 
 void Actor::SetTransform(const Transform& value)
@@ -1229,6 +1232,14 @@ void Actor::OnOrderInParentChanged()
     Level::callActorEvent(Level::ActorEventType::OnActorOrderInParentChanged, this, nullptr);
 }
 
+void Actor::OnStaticFlagsChanged()
+{
+}
+
+void Actor::OnLayerChanged()
+{
+}
+
 BoundingBox Actor::GetBoxWithChildren() const
 {
     BoundingBox result = GetBox();