Add unicodeRange to fontFace

[pedrobslisboa]

Description

It was missing the unicode-range property on fontFace. This PR adds it.
It also ran the make format

The unicode-range works under this type:

  type t =
    [ `single of string
    (* E.g. `single "1234" U+1234 *)
    | `range of string * string
    (* E.g. `range ("1234", "5678") U+1234-U+5678 *)
    | `wildcard of string * string
    (* E.g. `wildcard ("12", "??") U+12?? *)
    ]
    array

@davesnx I'm not so happy with ``wildcard ("12", "??")`. Do you have a better idea?

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[davesnx]

@davesnx I'm not so happy with ``wildcard ("12", "??")`. Do you have a better idea?

what about ``wildcard ("12")` and render ?? directly?

[davesnx]

Nice test

[pedrobslisboa]

@davesnx I'm not so happy with ``wildcard ("12", "??")`. Do you have a better idea?

what about ``wildcard ("12")` and render ?? directly?

I wonder if U+4? matches: U+40, U+400, U+4000, U+4000... . If don't, adding ?? dynamically may not be possible.