Enhancements to tutorial scripting steps

[livecodeali]

When using the "copy code to script editor" button, it would be nice to insert some comments on the code, too (perhaps repeating the explanations of the code the tutorial gives)

Might be nice if the first time that adding script comes up to say "normally, you'd write this yourself but, this time, here's some I made earlier so we can explain how it works"

From here - moved because the others were bugs.