Seating charts - 2024 edition

[carl-vbn]

This PR is here to make things a lot easier to work with

• Added imagedl.py script to facilitate image downloading
• Added roster.py to download rosters. It is also imported by other scripts to standardize roster parsing from CSV files (it can reliably load csv files with or without canvas headers)
• go_brr now imports seatingchart instead of calling it with os.system
• Updated README.md
• A counter of selected seats is now shown on the HTML pages, to make headcounts easier

fixes #32 #26 and starts on #29

[tzussman]

Overall this looks really good! I've left a bunch of small comments throughout.
My main concern at the moment is rosters.py -- I didn't take too close of a look at it, but I'm worried that it duplicates functionality that we have in get_class.py in cloud-mgt. More importantly, it looks like it uses a different API endpoint and does some more parsing than get_class does, so I just want to make sure that there aren't some small issues we're missing there (actually it looks like it does it better than get_class so there may be some improvements to make there). It could also do with some more documentation about what format it expects as input and the structure of the roster it returns in Python.

[carl-vbn]

@tzussman I implemented pretty much all of your feedback.

For rosters.py, I see your point. I added that file because it is very straightforward, not that many moving parts and allows the entire repo to be self-sufficient from retrieving all the files to generating the html. The advantage of the endpoint I'm using is that it returns the entire class in one query (I double checked, the number of entries it gives matches the number of valid rows in the CSV exported from the Grades tab).

If you think we should rely on cloud-mgt instead, I can easily strip the downloading functionality out of it. The file is also used by the other scripts to parse roster files, but none of them use the downloading functionality, that's fully manual. I've also added some more details on why this file is useful vs just loading the CSV in the other files directly.

[tzussman]

Left a couple more small comments – this is almost there!
Re: rosters.py, I think it's fine to use it here. In fact, I think you should look into changing the cloud-mgt version to use the endpoint you found, since it seems much simpler.

[carl-vbn]

@tzussman I hope this covers it! I also made rosters.py print things out a bit more nicely using a table, because it was just printing a big blob of unis before.

[tzussman]

This looks great, thanks Carl! Assuming you tested the latest round of updates, feel free to go ahead and merge! (I didn't closely read the print_table() code, but I trust that it looks a lot better now)

[carl-vbn]

I tested it all with the last changes before committing, so it should be good to go then. Thanks for all your feedback Tal!