feat(input.py): add support for reading .xyz files and raise InvalidFileFormat exception if file format is not supported
chore(gui): add warning popup when trying to use Mesh3D graph with .xyz file
chore(gui): refactor MainWindow.check_input_file method to handle .xyz files
chore(gui): refactor PreProcessWorker to use ScannedObject.from_file method
chore(math): add check for faces in verticalise function to avoid errors when faces is None
The ScannedObject constructor now handles the case where faces is None. Support for reading .xyz files has been added, and an InvalidFileFormat exception is raised if the file format is not supported. A warning popup has been added to the MainWindow when trying to use the Mesh3D graph with a .xyz file. The MainWindow.check_input_file method
