File names with a space causes importer to fail

[fnoyanisi]

If the input file name has space characters in it, the parser fails.

Ex. input file name "LNREL-correct values.csv"

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\Python\Python39\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:\Users\xxx\Tools\xc-convert-master\src\gui\xcguiapplication.py", line 304, in run_conversion
    table_name = csv_importer.read()
  File "C:\Users\xxx\Tools\xc-convert-master\src\importer\csvimporter.py", line 37, in read
    self.dbm.create_table(self.table_name, reader.fieldnames)
  File "C:\Users\xxx\Tools\xc-convert-master\src\dbmanager.py", line 34, in create_table
    self.cursor.execute(sql)
sqlite3.OperationalError: near "values_csv": syntax error