coretext: force LTR font shaping #1740
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Fixes #1737
We don't support RTL so if the shaper gives us RTL coordinates our rendering gets really messed up. We're tracking minimal RTL support in #1442. This behavior now matches Harfbuzz.
This PR also contains a bunch of adding CoreText APIs I tried but didn't end up using. I'm keeping them here in case we ever use them in the future.
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