* Fix the bug that 100% volume cannot be used.
* Make AudioDevice::setVolume() accept real volume rather than percent and make all backends consistent.
* Set the maximal volume of the alsa devices to 100.
Set proper default value for sysstat plugin to turn on cpu monitoring by default.
Refactor lxqt taskbar plugin and made using more than 1 taskbar possible.
Taskbar buttons manual ordering