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/match.gd

@@ -0,0 +1,18 @@
+func test():
+	var i = "Hello"
+	match i:
+		"Hello":
+			print("hello")
+			# This will fall through to the default case below.
+			continue
+		"Good bye":
+			print("bye")
+		_:
+			print("default")
+
+	var j = 25
+	match j:
+		26:
+			print("This won't match")
+		_:
+			print("This will match")