Made the predicted url in TagImportDialog clickable and open the url in a browser with QDesktopServices.
Also fixed the source url in window.py to use QDesktopServices
Upgraded dependencies and noticed a breaking change in pyqt5 (QMainWindow.move() requires integer parameters). Fixed it and introduced minimal versions in requirements.txt
Fixed a bug where editing the alias or implication of a tag caused a crash.
Also changed titles that were left unedited from the file name to stay empty inside the database and not be filled with the filename