[OTLayout] Add note about collect_glyphs() and recursive lookups
[OTLayout] Add hb_ot_layout_lookup_accelerator_t
Move code around
[OTLayout] Refactor a bit more
[OTLayout] Add is_inplace() method to GSUB
[OTLayout] Minor
[OTLayout] Minor
[OTLayout] Merge / templateize apply_string()
[OTLayout] Use is_inplace() when flipping buffers
[icu_le] Fix scaling

Seems to work...
Merge commit '9d9e72e94e7914f82ce62a304e7242f79c13edaf'