draft implementation of hotplug support for libsmu
undo wait_for
bugfixes - smu demo app now returns data
bugfixes
bugfixes
drop unique ptr so session doesn't self-destruct
bugfixes
bugfixes
bugfixes
move ChanMode to libsmu.hpp, add libsmuso target to makefile
reduce active device count when libusb errors out with NO_DEVICE
Revert "move ChanMode to libsmu.hpp, add libsmuso target to makefile"

This reverts commit 09a4bc3919a3a14dd6ea02d28b95bf2806efe6a5.
Merge pull request #6 from signalspec/hotplug

Hotplug