Oxygen-16 0.7.1

Unfortunately, there were quite some unintended bugs in the last version (some of them older than that, however), which are being addressed by this version
Saving files and re-opening might have sometimes led to crashes due to inconsistencies in the drawing's data. This should now be fixed in -- if not all -- at least most of the cases
Likewise, copying, cutting, and pasting is more robust now.
The last version prematurely updated some code leading to incompatibilities with older versions of Qt (especially pre-5.14). These older versions should now work again; support for Qt 4, on the other hand is completely removed, as it is doubtful whether that still worked anyway.
Translations should now really work throughout Molsketch (currently supported languages: Chinese, English, German, Greek).
Finally, for Windows, an installer is provided, which will download from a repository hosted at github.

Important note
Unfortunately, when removing the Qt4 support, I forgot that the settings contain the path to the libobabeliface.so. This used to be named libobabeliface-qt5.so, so it would probably be a good idea to add a link with that name during the build process (libobabeliface-qt5.so -> libobabeliface.so)