General:
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* Re-license project to MIT and remove the commercial offering
* buildsystem - Increase minimum CMake version to 3.12.0
* buildsystem - Build in Release mode by default (in non-developer situations)

Client-side:
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* Generate "explicit" in front of service and job constructors (issue #206)

Server-side:
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* Disable HTTP/2 support (which Qt 6 enables by default), it causes trouble with some SOAP servers (issue #246).
* Improve parsing of GET argument to avoid misinterpreting queries (possible security issue #247).

WSDL parser / code generator changes, applying to both client and server side:
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