Make HTML layout use harfbuzz for shaping.

fz_fonts gain a 'shaper' field that will be filled in as
required. Use a void * rather than an hb_font_t to avoid
polluting top level include space.

Harfbuff handles mirroring for us, so lose the 'mirror'
fields. This simplifies our wrappers around the 'standard'
bidi code in that we don't need to split fragments upon
mirroring.

We do need to split our fragments at script changes though
as harfbuzz only operates on a single font at a time.

Update the html flow structure so that each flow node contains
details of the the direction specified for it in the markup,
the language specified for it in the markup and the script
detected by the bidi code.

Get the bidi code to pass out the script for each fragment
as part of the callback and populate that field in the node.
Ensure that we pass in the markup direction to the bidi
splitting code as the 'base' direction.

When feeding the bidi code, rather than feeding it paragraphs
at a time, break those paragraphs if different parts of them
have different marked up directions.

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