Better previously selected leagues for SMB4

[tbrittain]

• Adds better display of previously selected leagues, including
  • Display of league name, the player's team (if applicable), number of franchise seasons played (if applicable), and when the user first connected to the save game
  • Orders in descending order by the number of times accessed, which means that franchises that are accessed most often appear at the top instead of being ordered simply by first created or last accessed
  • Auto-updates the cached description of the franchise league after new seasons are created

Closes #131
Closes #114