D18128: Refactor fullscreen ablement check into AbstractClient subclasses

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REVISION SUMMARY
  Most parts of this function are only relevant for X clients, in particular
  the "fullscreen hack". Therefore split up the function into the AbstractClient
  subclasses.

TEST PLAN
  Manually and autotests still pass.

REPOSITORY
  R108 KWin

BRANCH
  refactorIsFullScreenAble

REVISION DETAIL
  https://phabricator.kde.org/D18128

AFFECTED FILES
  abstract_client.cpp
  abstract_client.h
  client.cpp
  client.h
  geometry.cpp

To: romangg, #kwin
Cc: kwin, kvanton, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart