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[FIX #385] our cmake script now allows setting the environment variable "QTDIR" to point cmake to the right Qt directory, even if Qt5 is installed inside the system prefixes

[FIX #385] added Qt5 definitions and compile flags to openwalnut-qt5 executable. This should fix some compile issues with the pre-compiled QT5 versions.

[CHANGE] doxygen now generates tag files for external linking of our docs. Inspired by Christof Pieloths patch, but also applied to core-only doc.