Add main guard to examples (+ incredibly small fixes) #3181
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As @Starbuck5 pointed out on discord, many example lack the
guard and could run unexpectedly if auto-imported by some (not smart) IDE.
This PR fixes this.
You may also notice 2 or 3 very small unrelated fixes, I think they can pass too.
All examples still run, but you can run yourself aswell. I did the minimum refactoring possible.
NOTE: the diff github renders is kinda crazy, 99% of the time I just added one tab of indentation to the main functionality, I didn't actually change anything. You might want to compare them locally (or trust me).