D8168: kcm_input: Refactor the code and add support for libinput under X11

[Nathaniel Graham]

Restricted Application edited projects, added Plasma; removed Plasma on Wayland.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D8168

To: xuetianweng, davidedmundson, mart
Cc: romangg, ngraham, plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, schernikov, alexeymin, eliasp, hein
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