lib50 2.1, Windows support

[Jelleas]

No description provided.

[dmalan]

@Jelleas I didn't realize this was still pending, and I added readline back into develop (which had drifted from master). Are these good to be merged all together?

[Jelleas]

No this PR is stale and albeit undocumented is directly connected to another PR @ cs50/lib50#35. That in turn also grew stale and got closed last year.

I still believe it's ultimately worth the effort to try and get submit50/check50 to run under Windows at some point. But right now a lot of the underlying difficulties are tied to git and its need for a pseudoterminal for which there is seemingly little support under Windows. Given that git(Hub) might proof tricky to use soon, with the change to passwords, I'm not sure if it's worth the time/effort now.

[dmalan]

Hm, so this PR was from develop. Should we move the latest master on top of develop so that they're back in sync then, then I'll re-add readline?

[Jelleas]

Ah, that explains. So beyond the Windows support part there are some commits in develop related to a custom honesty prompt. That happen to also be linked to a lib50 PR (cs50/lib50#60). That should go through, but I personally won't have time to fix it this week or the next.

So for now, do move master back on top of develop, and in the future we should stop merging commits into develop if they're depending on a PR elsewhere 😅

[dmalan]

Okay, added back just readline for now if you want to re-PR with the requisite commits for lib50 when ready!

#250