Libtcod-cffi

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Removed
* Dropped support for Python3.3

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Fixed
* Made sure MacOS dependencies are bundled correctly.

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Added
* Renderer regressions fixed, OpenGL and GLSL renderer's are available again.
Changed
* The default renderer is now GLSL.
Removed
* `tcod` clipboard functions which were never fully implemented removed.

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Added
* Added support for loading/saving REXPaint files.
Fixed
* Console methods should be safe to use before a root console is initialized.
* Fixed simplex noise artifacts when using negative coordinates.
* Fixed backward compatible API inconsistencies with color indexes, console
truth values, and line_iter missing the starting point.
* The SDL callback should always receive an SDL_Surface.

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Fixed
* Fixed `Console.print_frame` not printing anything.
* Fixed Noise.sample_ogrid alignment issue.
* MacOS builds should work even if the system installed SDL2 library is old.

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Added
* You can now sample very large noise arrays using the `Noise.sample_mgrid`
and `Noise.sample_ogrid` methods.
* `Noise` class now supports `pickle` and `copy` modules.