add figurl support

[magland]

With these changes, this website can either be viewed stand-alone (using DATA/ directory) or embedded as a figurl figure.

Figurl example:
https://figurl.org/f?v=https://figurl-raster-vis.surge.sh/index.html&d=sha1://6960bfacd9d975c8aab448b80713e2e5c440f69e&label=figurl_data.json

As you can see from the v query parameter, this is deployed to surge.sh for now. See devel/deploy_surge.sh

The right way to do this is to utilize the @fi-sci/figurl-interface package. However, I was running into trouble bundling that in (I'm not too familiar with bower/gulp). So I converted the typescript to javascript, removed the await syntax, and included the figurl-interface code directly into this source.

See loadData.js -- it detects whether the site is being embedded in an iframe or not. If so, it communicates with the parent figurl window. If not, it loads the data from DATA/ as normal.

See devel/gather_example_for_figurl.py to see the format of the .json file that figurl is expecting.

[edeno]

I'm not sure what this file does?

[magland]

It copied the public directory to a dist directory, deletes the dist/DATA, and then uploads that directory to surge.sh under the name figurl-raster-vis.surge.sh, so that can be used as the v query parameter for the figurl views. I am the owner of that particular subdomain, but if someone else wanted to deploy it, they could just sign up for surge (free) and choose a different name.

[edeno]

Was it necessary to get rid of the package-lock?

[magland]

I found some problems when using the original package-lock.json, and I though it might be due to the fact that you are using darwin and I am using linux. But that might not be an issue any more, so we could try adding it once again to the repo (which is generally the recommended thing to do).