SMTP parser refactoring and Date header support for smtp#4

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Ri0n wants to merge 5 commits into

dbzhang800:masterfrom

Commits on Jun 2, 2016

Apply changes from https://bitbucket.org/libqxt/libqxt/pull-requests/42/smtp-reposnse-parser-rewritten-as-separate/diff and bring back qt4 support
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Commits on Jun 3, 2016

Date header support for smtp
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Commits on Jun 26, 2016

Added support for hierarchical mime messages
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Commits on Jul 4, 2016

Added forgotten header for Qt5
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Commits on Aug 17, 2016

Use QMap instead of QHash so we could set proper order for parts.
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