DEBUG AREA

Editing mode:

• Use '0-9' to change terrain (0 is ocean)
• Use 'r' to add road and railroad
• Use 'i' to add irrigaion
• Use 'c' to clear all improvements
• Use 'x' to toggle river
• Use 'd' to show debug overlay
• Use 'v' to switch player view
• Use 'e' to cause endOfTurn()