Maintain insertion order for subschemas of CombinedSchema #522
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Maintain insertion order for subschemas of CombinedSchema.
This is an alternative to #519 that maintains the subschemas in insertion order.
The subschemas were originally maintained in insertion order, but it was changed due to #405, which ensured that subschemas that were of type CombinedSchema were visited first during validation, and by #498, which tries to maintain a stable order for "equivalent" instances.
This PR simply restores the insertion order, but maintains an internally sorted collection for the two purposes listed above, namely visiting subschemas during validation and equivalence checks during equals/hashCode.