Log Message:
Update harfbuzz to 0.9.19, as well as add an option to compile with icu
support. Changes, apart from minor fixes, include:
    [ft] hb_ft_get_glyph_from_name fails for the name of glyph id 0
    [uniscribe] Fix buffer allocation
    [Indic] Add Javanese config
    [OT] Collect requiredFeature only if features are not provided
    Fix contextual lookup recursion indexing
    Destroy lookups before blobs.
    If variation selector is not consumed by cmap, pass it on to GSUB
    Skip over multiple variation selectors in a row
    util/ansi-print.cc: Use fallback implementation for lround on MSVC
    hb-uniscribe.cc: Re-enable build under Visual Studio