Lollipop

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Support "ordered" for the Dict type
Support PEP3102 and PEP570
Use correct import paths for Mapping and Sequence
Fix Number not reporting error for booleans
Fix Object.allow_extra_fields documentation markup

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* Fix Dict missing keys validation on load which resulted in multiple errors
* Fix missing Modifier export

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* Change List to not accept strings (as lists of one char strings)
* Fix DictWithDefault values() method not conforming to Mapping API
* Fix numeric types validation to not accept stringified numbers
* Improve documentation on how to customize error messages
* Fix missing IndexField export
* Fix load_into handling DumpOnly fields
* Simplify Type APIs by removing args and kwargs

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* Add support for loading extra attributes for Objects
* Update Dict to require presence of fixed keys
* Add IndexField to extract data from dict-like objects

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* Add support for serializing sequences and mappings other than list and dict
* Change Tuple type to return tuples on load()

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* Fix exports for Date, Time and DateTime types
* Update Object type default constructor to return object-like value