`nifskope` v2 contains a lot of new features and a new, QT5-based UI
(see https://github.com/niftools/nifskope/releases). Additionally the
2.0 sourcetree exists for quite a while and after some short user tests
it seems fairly stable.
The following aspects have been changed:
* Use QT 5.9 rather than QT4 (see #33248).
* GCC7 support from upstream (gcc6 patch not needed anymore, build on
GCC7 works fine), disabled `-Werror=format-security` can be used again
as compiler flag.
* Patched broken paths in `NifSkope_targets.pri` to point to the proper
dependencies (otherwise `<gli.hpp>` and `qhull` couldn't be found).
* Patched paths in `NifSkope.pro` to `lupdate` and `lrelease` (default
`QT_*` paths point to `libsForQt5x.qtbase` which doesn't contain the
needed binaries, instead they need to point to `libsForQt5x.qttools`).
* Added myself as maintainer.
