Added many more MIME types

[Anton-4]

should fix some file contents being erroneously wrapped in HTML when using reactor #1972

Quick Summary: Reactor served some file contents wrapped in html. This occurred for me when using csv files and made it difficult to use reactor for my application. Others have experienced this problem as well for other file types, see #1972 .
I added many mime types so certain files would no longer be returned as html. I did not yet test my new code because I could not find instructions on how to build elm. I will gladly perform testing given the necessary instructions

SSCCE

1. In an elm project, put any csv file in assets folder
2. elm reactor
3. wget http://localhost:8000/FILE_NAME.csv will return the file contents with lines of html added.

• Elm: 0.19.1
• Browser: firefox 72.0.1 (64-bit)
• Operating System: KDE Neon 5.17 > Ubuntu 18.04

[gcoakes]

I'm not a contributor to this project or anything, but @Anton-4 , it looks like you can compile elm by running docker build -t elm -f installers/linux/Dockerfile . from the project root. That will create a docker image which contains the compiled version of elm at /usr/local/bin/elm. It seems like a really weird way to build it when you could also just run cabal build, but that's how it's done in the .travis.yml.

[Anton-4]

Thanks for the tip, I'll make sure to give it a try!