• [varLib.models] Use a simpler model that generates narrower "tents" (regions, master supports) whenever possible: specifically when any two axes that actively "cooperate" (have masters at non-zero positions for both axes) have a complete set of intermediates.
  The simpler algorithm produces fewer overlapping regions and behaves better with respect to rounding at the peak positions than the generic solver, always matching intermediate masters exactly, instead of maximally 0.5 units off. This may be useful when 100% metrics compatibility is desired (#2218, #2717).
• [feaLib] Remove warning when about GDEF not being built when explicitly not requested; don't build one unconditonally even when not requested (#2744, also works around #2747).
• [ttFont] TTFont.getGlyphSet method now supports selecting a location that represents an instance of a variable font (supports both user-scale and normalized axes coordinates via the normalized=False parameter). Currently this only works for TrueType-flavored variable fonts (#2738).