GDScript: Improve call analysis

* Add missing `UNSAFE_CALL_ARGUMENT` warning.
* Fix `Object` constructor.
* Display an error for non-existent static methods.

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

@@ -36,6 +36,7 @@ class SayNothing extends Say:
 		print("howdy, see above")
 
 	func say(name):
+		@warning_ignore("unsafe_call_argument")
 		super(name + " super'd")
 		print(prefix, " say nothing... or not? ", name)