[issue3405] Add support for the new data option supported by event generate (Tk 8.5)

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +serhiy.storchaka
versions: +Python 3.4 -Python 3.3

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<http://bugs.python.org/issue3405>
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