Humdinger 8040281d80 setvolume: detailed usage info, print mute state ...

* Describe parameters in "usage".
* Change -m to explicitely mute, instead of toggling mute.
* Add -t to toggle muting, -u to unmute.
* Add long version options:
  --mute, --unmute, --togglemute --increase, --decrease
* Accept a step size as additional parameter to in/decrease,
  without it, the step size is 3 dB.
* Print muting state when toggling or un/muting.
* Update shortcut_settings to use "setvolume -t" to toggle muting.

Change-Id: Iacad5bcf4a40a6056c85161ac45379015392420c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5976
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: nephele <nep@packageloss.eu>

2023-01-03 06:46:14 +00:00

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