tooling: upgrade libs, rename VF fext otf -> ttf, add STAT table patch

- upgrades 3rd party libraries used by the toolchain
- upgrades fontbuild code to adjust changes to library APIs
- renames VF font filename extensions to .ttf
- adds better STAT table patch to improve metadata on Windows

misc/fontbuildlib/stat.py

@@ -0,0 +1,34 @@
+# from fontTools.designspaceLib import DesignSpaceDocument
+# from fontTools.ttLib.tables import otTables as ot
+# from fontTools.ttLib import ttFont
+from fontTools.otlLib.builder import buildStatTable
+
+def rebuildStatTable(font, designspace):
+  if not 'fvar' in font:
+    raise Exception('missing fvar table in font')
+
+  axes = [dict(tag=a.axisTag, name=a.axisNameID) for a in font['fvar'].axes]
+  # axes = []
+  # for a in statTable.DesignAxisRecord.Axis:
+  #   axes.append({ 'tag': a.AxisTag, 'name': a.AxisNameID, 'ordering': a.AxisOrdering })
+
+  axisNameToTag = dict()
+  for axis in designspace.axes:
+    axisNameToTag[axis.name] = axis.tag
+
+  locations = []
+  for instance in designspace.instances:
+    location = dict()
+    for axisName, value in instance.location.items():
+      tag = axisNameToTag[axisName]
+      location[tag] = value
+    locations.append({ 'name': instance.styleName, 'location': location })
+
+  buildStatTable(font, axes, locations)
+
+
+# font = ttFont.TTFont("build/fonts/var/Inter.var.ttf")
+# designspace = DesignSpaceDocument.fromfile('build/ufo/inter.designspace')
+# rebuildStatTable(font, designspace)
+# print("write build/tmp/Inter.var-patched.ttf")
+# font.save("build/tmp/Inter.var-patched.ttf")