Obsoleted methods from QHeaderView

Replaced all instances:
QHeaderView::setClickable --> QHeaderView::setSectionsClickable
QHeaderView::setResizeMode --> QHeaderView::setSectionResizeMode
QHeaderView::setMovable --> QHeaderView::setSectionsMovable

Change-Id: I6e583e322db1ebc902d6c86da284f4eef6e36dce