Simon Cozens 9f4cc2f1cb Introduce the concept of a ClassContextualRuleSet
Currently unused but will be super helpful for optimizing the formats of contextual lookups.

* Splits the rules of a class contextual lookup based on explicit subtable breaks
* Returns various properties on the ruleset to help determine appropriate layout format.
* (More properties, such as "touched glyphs", planned - will be added when needed.)
2020-07-07 12:44:25 +01:00
..
2020-03-10 21:42:28 +00:00