Newick parse feedback

Created by: Masboes

This implements success and error messages for parsing the Newick files. Currently uploading an invalid Newick file will result in an error in the console, while the user doesn't get any feedback. This implements a snackbar to show the user when the parsing was successful or unsuccessful. I also moved all the checks on the content of the Newick file to the parser, this makes more sense than to do some checks in the upload-tool and some in the parser.