Improve Connection Dialog method list

[KoBeWi]

• remove return type icons from method list
• add argument list to method list
• add argument list to "To Signal" box
• handle object types when checking compatible methods

Before

After

[Maran23]

Hm, why removing the return type icon?

[KoBeWi]

Because it's irrelevant for connections and only clutters the view. Return value of callbacks isn't used anywhere. EDIT: This was originally raised here: https://github.com/godotengine/godot/pull/66313#issuecomment-1404383785

[akien-mga]

Thanks!