CMakeLists: Drop LS2CXX and LUNA_SERVIVCE2 dependency

* there isn't any luna-service2++
* LUNA_SERVIVCE2 is probably typo and duplicated by LS2 few
  lines above

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
palmsystemextensio: adapt to new LS2 APIs

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Use Q_SIGNALS and Q_SLOTS instead of keywords defined in qobjectdefs.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>