Editable Children's Signal icon color should be yellow

[jinyangcruise]

As you can see, the colors of NodeA and NodeB are yellow because they are nodes of another scene, which is good. I suggest the signal icon's color also follow this principle. So the signal icon's color of NodeA should be yellow too while the signal icon's color of NodeB should be white because it connects to a function in Main.gd. If we connect NodeA's signal to a function not belong to its owner's scene, the color should be half-yellow-half-white. Like:

Of course, this is based on the dark theme I use. If a light theme is used, a difference may be introduced.

[jinyangcruise]

Now, imagine an Editable Children which contains many nodes that have a Signal icon. We can hardly know which node's signals connect to current script's function because they are all white color.