Add new modules for mypy to check

mypy.ini

@@ -1,16 +1,24 @@
 [mypy]
 python_version = 3.7
-files = Lib/fontTools/misc/plistlib
+files = 
+    Lib/fontTools/cu2qu/ufo.py,
+    Lib/fontTools/misc/plistlib,
+    Lib/fontTools/pens,
+    Lib/fontTools/ufoLib/glifLib.py,
+    Lib/fontTools/varLib/interpolatable.py,
+    Tests/pens/basePen_test.py,
+    Tests/pens/pointPen_test.py,
+    Tests/pens/utils.py
 follow_imports = silent
 ignore_missing_imports = True
 warn_redundant_casts = True
 warn_unused_configs = True
 warn_unused_ignores = True
+disallow_incomplete_defs = True
 
 [mypy-fontTools.misc.plistlib]
 check_untyped_defs = True
 disallow_any_generics = True
-disallow_incomplete_defs = True
 disallow_subclassing_any = True
 disallow_untyped_decorators = True
 disallow_untyped_calls = False