This currently untested and only works when compiling as C++.

 * mal_device_config_init()
 * mal_device_config_init_capture()
 * mal_device_config_init_playback()

 * Make device initialization more robust.
 * Add support for channel mapping.
 * Add support for 32-bit floating point formats.
 * Miscellaneous bug fixes.

As of this commit, this does not work in my testing environment. More
testing is needed for this one.