Fix most clang warnings about override, nullptr, range-based for loops.
Change-Id: Id47e57adb63a38e2f397a31511b788a2432c97cf
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Add a class to display debug messages, providing convenience functions for
installing and formatting parameters like indentation. It prints a startup
message containing relevant information about Qt.
Change-Id: Id0a19adbb5953a6ded1a8e692f242b63748e7273
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>