Add GUI code to tutorial snippets

[JamesDoingStuff]

• Adds GUI creation code to the tutorial snippets so that the demo.bob file is produced as expected. This is added as a new snippet (snippet05.py).
• Also makes small clarifications about the simulated temperature controller and why the last line gets commented out.

Note: After adding in the new snippet, I shifted the other snippet numbers to match. Git didn't like this much. So, while it may look like I made significant changes to all the snippets, this is actually just a consequence of the renaming. The only actual content changes are the gui creation lines towards the end of each one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #164   +/-   ##
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  Coverage        ?   92.35%           
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  Files           ?       40           
  Lines           ?     1962           
  Branches        ?        0           
=======================================
  Hits            ?     1812           
  Misses          ?      150           
  Partials        ?        0           

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[GDYendell]

Thanks @JamesDoingStuff! Just a few minor changes.