Better ANSI-interpret debug messages

* Show the number of KB saved
* Make the percent-saved a little more precise
* Don't update the debug message if absolutely nothing changed on the
  screen (although, it's still saving however much data it would have
  taken to render the entire screen!!)
* Just draw a bar across the whole screen, instead of a few extra "   "
  characters - technically this adds a whole bunch of data itself but
  it's assumed that you aren't on limited data if you're debugging how
  much data the interpreter saves

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