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improve types.optional rather than add types.optionalNull (#1192)

* add optionalNull type

* update changelog

* small optimization, reuse processors

* improved optional null and optional typings

* trying to get it to compile ok on travis

* fix tests

* removed some as anys

* rebuilt api docs

* removed useless bootstrap command

* enhance optional rather than add optionalNull

* very small optimization

* forgot to export IsOptionalType type

* small fix

* added one more test that checks that undefined can work as a missing value

* updated changelog

* added clarifications to the docs of optional

* more clarifications, unit test for missing property that should not be

* silly typos

* removed unneeded applyOptionalValuesToSnapshot

* improved a tiny bit the unit test

* slightly improved IsOptionalType

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