update CMakeLists to build with Qt 6 #256
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The provided src/CMakeLists.txt was setup for Qt5, with little adjustments it works perfectly with Qt6.
I set the minimum Qt version to 6.5 since it's the oldest still officially supported, and hence removed the support for Qt5. Anyway, the file could be configured to still support both versions.
Since Qt is also abandoning qmake in favor of cmake, it is crucial to have an updated CMakeLists.txt to build qzxing with cmake.