This update contains KDE PLasma 5.5.5 (boo#968966)

For details on the upstream release, see https://www.kde.org/announcements/plasma-5.5.5.php

The following tracked bugs were fixed in specific packages:

plasma5-desktop:
* boo#954215: KDE disabled touchpad on udev trigger

plasma5-workspace:
* boo#954623: prevents an empty icon being shown when fcitx is running
* boo#967538: fix issues when switching sessions
* boo#955280: prevent plasma from closing too early on logout resulting in an unusable desktop if the logout is cancelled
* boo#965922: plasma5-workspace: KDE session kept alive after logout

kservice:
* boo#966739: KDE/Plasma default application was broken

breeze-gtk:
* include dark theme variant

plasma5-desktop:
* fix synaptics issues (kde#359460, boo#969830)