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Added lambda expressions and function object in GDScript.

gen requested to merge github/fork/dbsGen/master into master 
func _ready():

  # Easier connection
  self.connect("renamed", on_renamed)

  var hello = "hello"
  # lambda expressions
  var lambda_func = func():
      print(hello)

  # or 
  func lambda_func2():
      print(hello)

  # lambda_func is a function object
  lambda_func.apply()
  lambda_func2.apply()

  # A native function object
  var native_func = self.set_name
  native_func.apply("new_name")


func on_renamed():
  print(get_name())

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