New date options

[itsFelixH]

• Added new date options to settings.yml. Changes the display text of dates in the returning soon overlay.
  • datedelimiter: "/" # Delimiter for dates. Can be "/", "-", "." or "", e.g. 01/14, 01-14, 01.14, 01_14
  • year_in_dates: False # Show year in dates: 01/14/22 vs 01/14. True or False
• Reworked date format constructing
• Updated README