Bugfixes and Minor Tweaks

I was inspired to work on some bugfixes this afternoon, based on some feedback from a couple of great test subjects beta testers!

• Update initial text on Tutorial 1 to indicate that you have more than one turn to reach the flag.
• Update text on Maze map to indicate that reaching any flag will win the game.
• Updated display of "Enter: Start" to "Enter: Start Turn"
• Added UI command "Esc: Quit"
• Added command "R" to reset the entire instruction queue
• Changed messagebuffer overflow text from "(more)" to "(press any key to continue)"
• Fixed robot destruction so that they will not continue to try to move and create blocked messages.