Godot: Expose call_multilevel to scripting

[mablin7]

I'm working on the framework of my game in Godot, and I use script inheritance, and function overriding a lot. And in order to call a function both in the children and the parent scripts, you would have to use call_multilevel, which is not yet exposed to GDScript.
I was about to make a PR, but then I thought it would be better to first make sure others would need this too

[bojidar-bg]

Was thinking of this today as well. It is sometimes useful to do a multilevel call of some functions.

I was wondering if it wouldn't it be better if we make it a flag on the function instead:

func test():
  pass
func call_test():
  call_multilevel("test")
# ----- OR -----
multilevel func test():
  pass
func call_test():
  test()

[akien-mga]

multilevel func test():

More seriously, I don't think it would be a good feature as a keyword. You might want to call multilevel at times, and not multilevel at other times, so a function is better.

[mablin7]

Yeah i also think a keyword would be unnecessary. It doesn't have to be overcomplicated.

[Calinou]

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