pactl, pacmd: Allow to unset the configured default sink or source

Georg Chini requested to merge gchini/pulseaudio:unset_default into master

Currently there is no way to unset the default sink or source once it was configured manually by the user. This patch introduces the special name @NONE@, which can be used with the pacmd or pactl set-default-sink and set-default-source commands to unset the user configured default. When the default is unset, pulseaudio will return to the standard default sink or source selection mechanism based on priority.

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