D15443: [server] Allow multiple touch interfaces per client and remove fallback code

[Roman Gilg]

romangg added a dependent revision: D15464: [server] Touch drag support.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D15443

To: romangg, #kwin, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns