[subset] Update the subset fuzzer to determine which options to use based on data in the fuzzing test case.
Add support for toggling retain_gids.

[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.

[skip ci]

[skip ci]

[skip ci]

c:\projects\harfbuzz\src\hb-ot-color-cbdt-table.hh(59): warning C4146: unary minus operator applied to unsigned type, result still unsigned [C:\projects\harfbuzz\build\harfbuzz.vcxproj]

I think Apple does very similarly, but probably with a stack size of 16.
We do it with a stack size that is currently set to 64.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1531

Before we used to give up.  Now, just ignore error and continue processing.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1531