• [svgPathPen] Continuation of #2471: make sure all occurrences of str() are now replaced with user-defined ntos callable.
• [merge] Refactored code into submodules, plus several bugfixes and improvements (#2473, #2475, #2476):
  • fixed duplicate-glyph-resolution GSUB-lookup generation code;
  • use tolerance in glyph comparison for empty glyph's width; ignore space of default ignorable glyphs;
  • downgrade duplicates-resolution missing-GSUB from assert to warn;
  • added --drop-tables option.