Bobingabout New Game Modes

Adds more `New Game Modes` based on settings I like to use when starting a new game. They're really just difficulty settings, but this is what the game calls them. Basic overview of the modes: Chill: Very easy game mode with no bad tides. Polluted: Around Normal difficulty, but with a very high chance of bad tides. Balanced: With the exception of early game handicap, All seasons are 20 days long. Long: Droughts and Bad Tides can last up to 100 days long. Temperate can last 30 days though so it's not quite Apocolypse. Apocalyptic: Droughts and Bad Tides can last up to 80 days long, with a wet season of only 4 to 8 days. Also, start with low resources, only 9 beavers, no refunds, and beavers consume 120% food and water.