Codecs cleanup

[surma]

Closes #160
Closes #162

• Properly containerize all wasm bits (you should all be able to build the codecs now if you have Docker installed)
• Switch all codecs to -Os
• Remove old build targets from top-level package.json

[jakearchibald]

Just tried building imageqaunt on this branch and my output looks very different. It might be asm.js? Is there something I need to do to update the docker container? If so, should that be part of the install script?

[surma]

Do you have a super old version of the container image? emcc switch to wasm-by-default at some point during squoosh so I stopped passing -s WASM=1.

Run docker pull trzeci/emscripten to update and try again plz?

[jakearchibald]

That did the trick. Is it worth adding docker pull trzeci/emscripten as a postinstall?

[surma]

An update is usually around 500MB. Not sure I wanna force that onto everyone automatically.

[jakearchibald]

What about a warning if trzeci/emscripten is out of date?

[surma]

I’ll look into that

[jakearchibald]

I've now built all the codecs and got the same results as the stuff checked in \o/

[surma]

It’s actually surprisingly hard. I can’t find a way to check for a new version on the Docker Hub. Can we punt on the check?

[jakearchibald]

I'll settle for outputting "Did you remember to docker pull trzeci/emscripten??" at the end of each build, and create an issue to figure out something better.

Given that we're running this & checking in the result, it feels important to remind people to do that step.

[surma]

@jakearchibald Done :)