[kateprinter] Portaway from deprecated QPrinter methods

Merged Ömer Fadıl Usta requested to merge work/usta_qprinter_port into master

getPageMargins -> pageLayout().margins() setPageMargins ( qreal, qreal, qreal, qreal, QPrinter::Unit) -> setPageMargins(QMarginsF, QPageLayout::Unit) QPrinter::Millimeter -> QPageLayout::Millimeter

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