Remove dependency on PulseAudio and remaining references to it
The sound-theme widget has same dependencies as MVC and is always built, reflect that in build files.
Remove some obsolete parts of configure.ac and clean it up a bit
Fix variable name in a Makefile.am
Restore the debug command-line option in MVC as done previously for the applet
Remove useless checks for Yelp
Rename mvc-helpers.{c,h} -> gvc-utils.{c,h}
Move some files and directories to better locations

- mate-volume-control/data changed to /data
- mate-volume-control/src/* moved to mate-volume-control
- sound-theme/sounds changed to /data/sounds
- sound-theme/*.{c,h} moved to mate-volume-control
- Removed AUTHORS and ChangeLog.pre-2-26 from mate-volume-control
Remove unused parts of Makefiles and clean up tabs
Update according to changes in libmatemixer
Improve GvcComboBox and related code

The combo box now includes an own reference to MateMixerSwitch. This simplifies GvcMixerDialog and makes the code more readable.

This change also includes a fix for oversized profile switch label and asynchronous updates of profile names in the HW tab.
Fix look of the peak meter on GTK3 and use a support function from libmate-desktop instead of custom copy&paste
Remove extraneous variable from configure.ac
Add forgotten GTK+ version check to GvcLevelBar
Bump version and update NEWS
Merge branch 'michal-wip'
Remove unused variable
Build gvc-utils for mate-volume-control only as it is not used by the applet