Add option to check if headset is connected

When writing scripts using headsetcontrol, it would be very practical having
a flag which checks if there is a headset connected.

Will be provided indirectly over
#271
(Feel free to comment there for feedback)

Yeah but when writing stuff like bash scripts (e. g. for an i3 status bar module) it
would be really convenient if you could do something like

if [ headsetcontrol --connected ] ; then

and it feels like it should exist.

Makes sense, will probably implement that and --count or so to check how many are connected (used for further use cases).

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