https://github.com/harfbuzz/harfbuzz/issues/1566

Not sure why I don't get it, but this warning:

warning: base class ‘struct hb_iter_fallback_mixin_t<hb_array_t<const OT::UVSMapping>, const OT::UVSMapping&>’ should be explicitly initialized in the copy constructor [-Wextra]

./hb-algs.hh:37:3: error: unused function template 'operator()' [-Werror,-Wunused-template]
  operator () (const T& v) const { return v; }
  ^

[subset] Add --retain-gids option to the subsetter.

[subset] Re-add glyphs array to subset plan, with new name 'glyphs_deprecated'. Switch CFF subsetting to use it.

Re-implement HMTX/VMTX subsetting. Update it to support glyph renumbering and simplify the implementation.

Update maxp to use the correct num glyphs.

- Extract code out into helper methods in several places.
- Bundle loca address, size and is short into a struct.

Using decltype() instead.

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