Ownership P2: Clarify UB dangers

[jespiron]

If the transcript and outline look good, I'll turn them into slides

They'll be inserted in #50 according to outline.md

Note the transcript is not what I'll say verbatim in lecture, it's a sketch of my points. Faster to review 80ish lines than gazillion lines of slides. They'll also be clearer when animated visually in slides

Main changes

• Add Box example from Brown book as per review comments
• Delete struct example
• Add examples to illustrate dangers of undefined behavior as per Refocus Ownership P2 on high level #60 (comment)

I wrote demo programs for the exploits discussed - they won't be assigned to students as homework, but are available if students are curious to dive deeper

[jespiron]

Ok, I went ahead with slides at #62