supernova: fix plugin loading

Signed-off-by: Tim Blechmann <tim@klingt.org>
cmake build system: supernova requires c++11 mode on osx
supernova: replace sized_array by std::vector

Signed-off-by: Tim Blechmann <tim@klingt.org>
supernova: fix command line parser for hardware device

Signed-off-by: Tim Blechmann <tim@klingt.org>
supernova: portaudio backend - default to high latency

low latency is a great way to cause audio dropouts even on fancy mac
hardware.

Signed-off-by: Tim Blechmann <tim@klingt.org>