Release 5.2.0

• see git history for complete list of changes
• update to audioprobe.cpp to list devices for all APIs
• miscellaneous build system updates
• PulseAudio device detection fixes
• various WASAPI updates (thanks to Marcus Tomlinson)

A distribution of the release with the configure script and documentation already generated is available at:

• http://www.music.mcgill.ca/~gary/rtaudio/release/rtaudio-5.2.0.tar.gz