New stable release of xfce4-power-manager.
* New features:
 - Add support for XF86Battery button (Bug #14055)
* Bugfixes:
 - Fix compiler warning (Bug #14104)
 - Fix various warnings
 - Don't autostart the power manager in the LXQt DE (Bug #14450)
 - Don't overwrite the user's XScreensaver settings (Bug #14968)
 - Fix slider labels (Bug #14395)
 - Replace xfconf_channel_new by xfconf_channel_get
 - Read from actual_brightness instead of brightness
 - Fix g_type_class_add_private is deprecated
 - Handle glib deprecations
 - Use the newer up_client_get_devices2
 - Install Appdata in metainfo (Bug #15380)
 - plugin: Show discharge level even in unknown state (Bug #15280)
 - settings: change "going from sleep" to "going to sleep"(Bug #15144)
 - settings: Improve devices tab visually by adding frame

* Translation updates:
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  Ukrainian, Uyghur, Vietnamese