Fonttools

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- [feaLib] Do not fail on duplicate multiple substitutions, only warn (1811).
- [subset] Optimize SinglePos subtables to Format 1 if all ValueRecords are the same
(1802).

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- [unicodedata] Update RTL_SCRIPTS for Unicode 11 and 12.

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- [otTables] Fixed bug when splitting `MarkBasePos` subtables as offsets overflow.
The mark class values in the split subtable were not being updated, leading to
invalid mark-base attachments (1797, googlefonts/noto-source145).
- [feaLib] Only log a warning instead of error when features contain duplicate
substitutions (1767).
- [glifLib] Strip XML comments when parsing with lxml (1784, 1785).

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- [subset] Fixed issue with subsetting FeatureVariations table when the index
of features changes as features get dropped. The feature index need to be
remapped to point to index of the remaining features (1777, 1782).
- [fontBuilder] Added `addFeatureVariations` method to `FontBuilder` class. This
is a shorthand for calling `featureVars.addFeatureVariations` on the builder's
TTFont object (1781).
- [glyf] Fixed the flags bug in glyph.drawPoints() like we did for glyph.draw()
(1771, 1774).

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- [glyf] Use the ``flagOnCurve`` bit mask in ``glyph.draw()``, so that we ignore
the ``overlap`` flag that may be set when instantiating variable fonts (1771).

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- [pens] Added the following pens:

* ``roundingPen.RoundingPen``: filter pen that rounds coordinates and components'
offsets to integer;
* ``roundingPen.RoundingPointPen``: like the above, but using PointPen protocol.
* ``filterPen.FilterPointPen``: base class for filter point pens;
* ``transformPen.TransformPointPen``: filter point pen to apply affine transform;
* ``recordingPen.RecordingPointPen``: records and replays point-pen commands.

- [ttGlyphPen] Always round float coordinates and component offsets to integers
(1763).
- [ufoLib] When converting kerning groups from UFO2 to UFO3, avoid confusing
groups with the same name as one of the glyphs (1761, 1762,
unified-font-object/ufo-spec98).