[Form] Support \DateTimeImmutable#25582

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vudaltsov wants to merge 7 commits intosymfony:masterfrom

vudaltsov:form-datetime-immutable

Commits on Feb 6, 2018

Added input=datetime_immutable for DateType, TimeType, DateTimeType.
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10b49c3
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Use createFromFormat when transforming DateTimeImmutable -> DateTime.
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6c07eb5
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Removed return typehints in DateTimeImmutableToDateTimeTransformer.
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1590140
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Marked DateTimeImmutableToDateTimeTransformer as final.
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a0a8e64
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Use assertEquals to compare \DateTimeImmutable.
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83697db
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Added line to CHANGELOG.
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7721aed
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Added instanceof assertions.
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1eff2b5
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