Console Improvements

[aaajug]

Hello, found out about this project today and I absolutely love it! Hoping I could suggest the ff. improvements to make the environment more user-friendly:

• Adjustable console height:
  • could have a limit, say 80% of the screen height.
  • content should follow console on resize (eg. upon height increase, previous lines should appear)
• Vertical scroll for the console
• Fix error messages
  • eg:

  puts "Hello, run.rb!
  
  # produces the error:
  # playground.rb:1: unterminated string meets end of file
  # �[m�[1mputs "Hello, run.rb!�[1;4m�[;1m�[m