Replaced QDesktopWidget::availableGeometry() and QDesktopWidget::screenGeometry() Calls

Karel Slanýrequested to merge
qscreen-geometry into develop

In Qt-5.14.0 the compiler complained about replacing QDesktopWidget::availableGeometry() and QDesktopWidget::screenGeometry() calls.

The replacement code is based on functionality which should be, according to the documentation, available since Qt-5.0.

Edited by Karel Slaný

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