Libtcod-cffi

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* updated to compile with libtcod-1.6.2 and SDL-2.0.4

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* sub packages have been removed to follow the libtcodpy API more closely
* bsp and pathfinding functions which take a callback no longer have the
userdata parameter, if you need to pass data then you should use functools,
methods, or enclosing scope rules
* numpy buffer alignment issues on some 64-bit OS's fixed

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* switched to using pycparser to compile libtcod headers, this may have
included many more functions in tcod's namespace than before
* parser custom listener fixed again, likely for good

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* version increment due to how extremely broken the non-Windows builds were
(false alarm, this module is just really hard to run integrated tests on)

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* SDL is now bundled correctly in all Python wheels

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* now using GitHub integrations, gaps in platform support have been filled,
there should now be wheels for Mac OSX and 64-bit Python on Windows
* the building process was simplified from a linking standpoint, most
libraries are now statically linked
* parser module is broken again