Added handling and documentation for additional keys: backspace, tab,
newline, delete, home, end, page up, page down, escape, fkeys.
Changed Blob test to compile with new API.
Added getWidth(), getHeight(), getCurrentWidth(), getCurrentHeight() to
WorldCanvas.  TypingExample allows you to interactively test these as
well as a bunch of special key codes.
Added a few more demonstrations of funworld programming.