```python
>>> a = DataBuffer('abcd')
>>> str(a)
'abcd'
```
This PR encodes a python3 str to bytes using `charmap`. It verifies that `bytes != str` to only encode a python3 str and not a python2 str.

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<tr class='logheader'><td><span title='2019-01-17 16:21:24 -0500'>2019-01-17</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=5f4b0984c0f2ff59bb82b959d49b11ee534976bd'>update company name and copyright date</a></td><td>Jordan Wiens</td></tr>
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<tr class='logheader'><td><span title='2018-12-22 18:35:24 -0500'>2018-12-22</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=b0e3bd2733ee100483b79eb09fd57534f8a80900'>Python2/3  support</a></td><td>KyleMiles</td></tr>
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<tr class='logheader'><td><span title='2018-07-13 19:25:15 -0400'>2018-07-13</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=2c7f443ce0b3d92ea44acb440c1891344eacc6d4'>Python2/3 String Compatibility Fix</a></td><td>KyleMiles</td></tr>
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<tr class='logheader'><td><span title='2018-07-10 18:11:09 -0400'>2018-07-10</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=5d4015659d20cfee839ccccdcfb96094ac8e610a'>Various Python 3 support changes</a></td><td>KyleMiles</td></tr>
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</td></tr>
<tr class='logheader'><td><span title='2018-07-10 18:11:09 -0400'>2018-07-10</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=5cff3bf3cc5aa11875569a6aeddf88ef867411f1'>Various Python 3 support changes</a></td><td>KyleMiles</td></tr>
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</td></tr>
<tr class='logheader'><td><span title='2018-07-10 18:11:08 -0400'>2018-07-10</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=8849fb2b2b8dc824bd3f17ce1026a04856477a94'>working division, prints, and metaclasses, but imports broken, still needs work</a></td><td>Jordan Wiens</td></tr>
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<tr class='logheader'><td><span title='2017-05-19 12:08:21 -0400'>2017-05-19</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=aac1ebc6c004fc908c72d7dbee96d48d79440df4'>update copyright year</a></td><td>Jordan Wiens</td></tr>
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</td></tr>
<tr class='logheader'><td><span title='2016-10-28 20:16:37 -0400'>2016-10-28</span></td><td class='logsubject'><a href='/public/binaryninja-api.git/commit/python/databuffer.py?id=5e4cca1f1796bec109adacdb049d9e34c17656eb'>Refactor python api into separate files and add Enumeration support. Also ↵</a></td><td>plafosse</td></tr>
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fixed bugs found with pyflakes


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