Move the font scanning code into private modules

kiva/fonttools/_constants.py

@@ -0,0 +1,26 @@
+# (C) Copyright 2005-2021 Enthought, Inc., Austin, TX
+# All rights reserved.
+#
+# This software is provided without warranty under the terms of the BSD
+# license included in LICENSE.txt and may be redistributed only under
+# the conditions described in the aforementioned license. The license
+# is also available online at http://www.enthought.com/licenses/BSD.txt
+#
+# Thanks for using Enthought open source!
+
+weight_dict = {
+    "ultralight": 100,
+    "light": 200,
+    "normal": 400,
+    "regular": 400,
+    "book": 400,
+    "medium": 500,
+    "roman": 500,
+    "semibold": 600,
+    "demibold": 600,
+    "demi": 600,
+    "bold": 700,
+    "heavy": 800,
+    "extra bold": 800,
+    "black": 900,
+}