General:
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* C++17 is now required. Qt-5.15 is still supported, in addition to the latest Qt6 versions.

Client-side:
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*

Server-side:
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* To avoid mixing up raw-xml requests in the same server object (#288), KDSoap now creates a server object for each incoming connection.
  Make sure your server object is ready to be created multiple times (this was already a requirement when enabling multi-threading with setThreadPool()).