Adding Practice Exercises

[colinleach]

With all the effort going (quite rightly!) into the Learning Syllabus, we haven't done much with Practice exercises in the last year or two. In a week when I can't summon the mental energy for anything more demanding, I've been poking at a few of the 53-exercise backlog.

Current status for Julia and a few other tracks is on Sheets. This is current for mid-September, but won't automatically update. I find it useful to locate tracks which have implemented some of the newer exercises. It's also interesting to see which exercises have been marked "foregone" by multiple tracks, suggesting they are maybe not our top priority.

Are there any missing exercises which are a poor fit for Julia (or a personal bugbear for the maintainers)? If so, we should add them to a foregone list in config.json to take them out of consideration.

[depial]

I tried going through these some time ago and porting the ones I found most personally interesting. I remember it was getting harder to pique my interest after about a dozen or so, but I can't particularly remember if I noticed any that were explicitly bad fits. I'll have to try to have a look at the descriptions again when I have a bit more time to see if I can pick out any that are.

[colinleach]

I'm currently tinkering with exercises created in the last few months, like baffling-birthdays and interstellar-transmission. I don't have an educated opinion about most of the older missing exercises.