Together with commit aee9e90c1ce0257d12ea85029435db8ffa65a6a1 , compilation with Qt 5.9.7 succeeds now, still builds fine with newer versions as well (tested 5.12.7 and 5.14.1)
Before, I got this compiler error:
```
[ 128s] In file included from /home/abuild/rpmbuild/BUILD/tellico-3.3/src/gui/imagewidget.cpp:27:0:
[ 128s] /home/abuild/rpmbuild/BUILD/tellico-3.3/src/gui/../images/image.h:62:3: error: 'qsizetype' does not name a type; did you mean 'iswctype'?
[ 128s] qsizetype byteSize() const;
[ 128s] ^~~~~~~~~
[ 128s] iswctype
```