Smaller and Simpler

This release switches the Python API to use Cython instead of SWIG, making the code somewhat more readable (but not actually smaller). In addition, the Config class has been improved in various ways, to allow a more Pythonic interface. There is some magic involved. It will likely change again in the future to remove this magic at the C level.

JavaScript builds compile but have not been tested, this will be the next release, probably.