v1.8.0

• Prompt the user if they try making a substitution outside of beginning/halftime/end-of-game
• Change the background color of the next question button when it changes to Export to make it clearer to readers that they should export at the end of the game
• Add keyboarding to the team entry in the manual new game dialog to make it easier to add players
  • Up+down keys will move between the team name, different players, and the add player button
  • Left+right keys will move between the player name, is starter checkbox, and delete button