QItemDelegate was superseded since Qt4 by QStyledItemDelegate but it
took until Qt6.7 to remove the last occurrences in qtbase.
- remove unused includes / replace with qabstractitemdelegate.h
- replace references in the documentation with QStyledItemDelegate
- adjust the examples and tests to use QStyledItemDelegate
Pick-to: 6.5 6.6
Change-Id: I246755004ce2d01192a726ca0972106c237df0cc
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
4e8b54eb81