Add dozens of new integration tests to the GDScript test suite

This also ignores `.out` files in the file format static checks.

modules/gdscript/tests/scripts/parser/features/super.gd

@@ -0,0 +1,60 @@
+class Say:
+	var prefix = "S"
+
+	func greet():
+		prefix = "S Greeted"
+		print("hello")
+
+	func say(name):
+		print(prefix, " say something ", name)
+
+
+class SayAnotherThing extends Say:
+	# This currently crashes the engine.
+	#var prefix = "SAT"
+
+	func greet():
+		prefix = "SAT Greeted"
+		print("hi")
+
+	func say(name):
+		print(prefix, " say another thing ", name)
+
+
+class SayNothing extends Say:
+	# This currently crashes the engine.
+	#var prefix = "SN"
+
+	func greet():
+		super()
+		prefix = "SN Greeted"
+		print("howdy, see above")
+
+	func greet_prefix_before_super():
+		prefix = "SN Greeted"
+		super.greet()
+		print("howdy, see above")
+
+	func say(name):
+		super(name + " super'd")
+		print(prefix, " say nothing... or not? ", name)
+
+
+func test():
+	var say = Say.new()
+	say.greet()
+	say.say("foo")
+	print()
+
+	var say_another_thing = SayAnotherThing.new()
+	say_another_thing.greet()
+	say_another_thing.say("bar")
+	print()
+
+	var say_nothing = SayNothing.new()
+	say_nothing.greet()
+	print(say_nothing.prefix)
+	say_nothing.greet_prefix_before_super()
+	print(say_nothing.prefix)
+	# This currently triggers a compiler bug: "compiler bug, function name not found"
+	#say_nothing.say("baz")