Qt6 Support: USE_QT6=AUTO|ON|OFF#1027

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jonoomph wants to merge 3 commits intodevelopfrom

Commits on Dec 18, 2025

Adding Qt6 detection and compatibility, without breaking Qt5. `-DUSE_QT6=AUTO|ON|OFF` (default: `AUTO`; prefers Qt6 when available and CMake ≥3.16, `ON` forces Qt6, `OFF` forces Qt5). Also, a few v…
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Commits on Dec 22, 2025

Adding missing packages to our linux install instructions doc:
jonoomph
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Improving swig bindings for Python, Java, and Ruby for access direct pixel byte array:
jonoomph
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