Consider an alternative to reqwest

[orf]

Reqwest is used in one major place: open, to obviously support opening remote URL's.

However reqwest the dependency adds 68 dependencies to the build, and about 4mb to the release binary size.

reqwest pulls in a lot of the tokio stack, and seems to support things like HTTP/2. Do we really need this? Is there a smaller, perhaps simpler library we could use instead?

[sophiajt]

One possibility would be Surf (https://blog.yoshuawuyts.com/surf/) or something like it

[jbcden]

I would like to try working on this if that is ok. I am hoping to try and open a PR tomorrow! I am currently trying to go with surf as mentioned above.

[sophiajt]

@jbcden - sounds good! you can see a PR I started (#397) but it needs to work to finish it

[jbcden]

@jonathandturner Sounds good! I am looking at it now! I started to look at this yesterday but your branch is a fair bit further along!