Cchardet

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- fix that different results with different chuck sizes
- fix that assignments to nsSMState in nsCodingStateMachine result in unspecified behavior
- include COPYING in package

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- add cchardetect CLI script (`30`_) `craigds`_

.. _30: https://github.com/PyYoshi/cChardet/pull/30
.. _craigds: https://github.com/craigds

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- fix an issue where UTF-8 with a BOM would not be detected as UTF-8-SIG (fix `28`_)
- pass NULL Byte to feed() / detect() (fix `27`_)

.. _28: https://github.com/PyYoshi/cChardet/issues/28
.. _27: https://github.com/PyYoshi/cChardet/issues/27

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- Improve tests

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- Update uchardet repo (Fix buffer overflow)

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- Implement UniversalDetector (like chardet)