File uploader bugs

[catarak]

In the current editor, I have begun to add media uploads. As this is a fairly complicated task, as it stands right now, it only works for:

• jpg/jpeg, png, gif (single frame), and tif
• If you put it in your JS files. Will not resolve media in HTML and CSS.
• If you download the project as a zip, it will download the images.

Eventually you will be able to uploads fonts, videos, and so on, and will parse it in all file types, but for now, I think it's good enough for teaching basic p5.js.

[catarak]

Next step: uploading text files! I think I'll need to add a file limit size, especially for files types like .json, which can be really big, and those will get uploaded to S3 rather than to the mongo database.

[REAS]

I'm making a note that I don't think SVG uploading is working. This isn't mentioned in the first comment, but I'm assuming it hasn't be attempted yet.

[shiffman]

To add to the pile of files that students are trying to upload to the editor, I had one working with loadModel() this morning that wanted to upload an OBJ file.

[catarak]

I can handle this file types no problem! I just need to whitelist them.

[catarak]

Just tried adding SVG's but I couldn't get it to work because of processing/p5.js/#1648. Obj files are now working though and deployed.

[catarak]

just added support for font files: .tff and .otf, deployed.

[REAS]

The interface makes it feel like more than one file can be uploaded at a time, for example to load three images with one drag into the box, but only one is uploading at a time.

[catarak]

i'm going to close this--there's a separate ticket for the UX for the uploader being confusing (#271), and if there are bugs this ticket can be reopened.