QDS-11148 - Qt6.6 integration

Morten Sorvigrequested to merge
QDS-11148/6.6-loader-fix into master

Main change here is moving the "screen" element out from the "qtspinner" hierarchy, which avoids hiding it when qtspinner is hidden. Also rename it to "qtcontainer".

Other fixes:

  • there is no longer a qtLoader object. We can access the instance after startup instead.
  • remove old preRun workaround
  • the canvas is now used only for detecting WebGL support
  • call setContainerSize from onLoad
  • make DesignViewer::printError() actually print the error

Closes QDS-11148

Edited by Burak Hançerli

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