The bug was causing CharString of the last glyph corrupt

also get_size

Added serialize functions to CFF2 structs
Fixed issues & bugs & code cleanup
Now subsetting CFF2 table outputs something

Added sanitize functions to FDSelect
Added satnitize calls for FDSelect, VariationStore, FDArray, TopDict

Unused so far.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1107

Prevents O(n^2) run times.

Should fix bots again.

Should fix Windows build again.

Move out-of-class definitions of two methods to hb-static so they
are accessible in libharfbuzz-subset.

Clang is being really peculiar.  Fix with:

-  inline hb_blob_t *sanitize (hb_blob_t *blob) { return c->sanitize<Type> (blob); }
+  inline hb_blob_t *sanitize (hb_blob_t *blob) { return c[0].template/*clang idiosyncrasy*/sanitize_blob<Type> (blob); }

Fixes #1105.

This new API returns cvXX and ssXX related NameId, things like
featUiLabelNameId, featUiTooltipTextNameId, sampleTextNameId, ... of cvXX
and UINameId of ssXX, in a unified way.

However HarfBuzz currently doesn't expose an API for retrieving the actual
information associated with NameId from the `name` table and that should be
done separately.

Index, Dict structs
hooked up to hb-subset (takes CFF2, outputs empty CFF2)