[ufoLib / interpolatable] Wire up outputImpliedClosingLine parameter

ufoLib's glyph draw() was passing outputImpliedClosingLine=False to
PointToSegmentPen(). This was causing incompatible nodes in
interpolatable tool for certain fonts, like this in NotoSansDevanagari:

Glyph dabhadeva was not compatible:
    Node count differs in path 1: 23 in NotoSansDevanagari-Bold, 24 in NotoSansDevanagari-CondensedBold
    Node count differs in path 1: 24 in NotoSansDevanagari-CondensedBold, 23 in NotoSansDevanagari-CondensedLight

Because a final lineto before a closepath was being elided or not in
some masters but not others.  Wire up the parameter and control it
from interpolatable tool to fix this.

Lib/fontTools/ufoLib/glifLib.py

@@ -95,11 +95,11 @@ class Glyph:
 		self.glyphName = glyphName
 		self.glyphSet = glyphSet
 
-	def draw(self, pen):
+	def draw(self, pen, outputImpliedClosingLine=False):
 		"""
 		Draw this glyph onto a *FontTools* Pen.
 		"""
-		pointPen = PointToSegmentPen(pen)
+		pointPen = PointToSegmentPen(pen, outputImpliedClosingLine=outputImpliedClosingLine)
 		self.drawPoints(pointPen)
 
 	def drawPoints(self, pointPen):

Lib/fontTools/varLib/interpolatable.py

@@ -166,7 +166,10 @@ def test(glyphsets, glyphs=None, names=None):
                 perContourPen = PerContourOrComponentPen(
                     RecordingPen, glyphset=glyphset
                 )
-                glyph.draw(perContourPen)
+                try:
+                    glyph.draw(perContourPen, outputImpliedClosingLine=True)
+                except TypeError:
+                    glyph.draw(perContourPen)
                 contourPens = perContourPen.value
                 del perContourPen