Jef Driesen 0f6d23757f Add a new library context object.
With the introduction of a context object, library initialization and
shutdown can be performed without requiring any global state. A single
process can use multiple independent contexts without any problems. The
lack of a global state also improves the thread-safety of the library.

At the moment, the new context object is primary used to implement an
improved logging system.
2012-08-27 23:02:44 +02:00
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