Custom QT namespace support missing

[Damien Lefevre]

Hi,

If you have built Qt to add infix and namespace, the build will fail as the code is not namespace aware. See https://wiki.qt.io/Qt_In_Namespace.

I've attached a patch that fix the issue.

[Matt Broadstone]

@damien-specim thanks! would you be willing to put together a PR for this?