Qt 6.5 LTS

WinCC OA comes with the newest 6.5 LTS version of Qt
Due to the QT upgrade, some drawing details have changed. A configuration option is available to restore the legacy behavior:
```
[ui]
compatLegacyPainting = 1                  //Default is 0, Set to 1 to activate legacy behavior
```
This affects:
- Drawing of diagonal lines
- Font rendering
- Fill pattern

Note: When you are using Qt for own developments (e.g. EWOs), you might need additional, commercial Qt licenses. We recommend checking https://www.qt.io/pricing for details.