This is patch one out of three in support of the new {nav Appearance} section layout in Plasma 5.16 decided upon on in {T8871}.
In this patch, the orderingKCMs are moved out of some KCMs is changedthe {nav Workspace Theme} category, a few are moved outand the ordering of the {nav Workspace Theme} category,some KCMs is changed accordingly. and some names and comments are changedThe now-empty category gets deleted in D18417.