Upgrade npm packages.

I have updated all packages which did have patch updates or minor updates. I could reduce the number of warnings from yarn quite a bit. Lock file and package.json are both in sync again.

This is a preparation for possibly bigger updates on the rest of the packages.

Only major updates have been made for shx and webpack in order to get it still running. I have also added a little fix to some js tests to please our linter.

How confident are you it won't break things if deployed?

Should be ok. Visual tests have been good. CI is passing after some tweaks. The map does look better on localhost.

Checklist

• added a test, or explain why one is not needed/possible... (general changes which should be mostly covered by CI. We have to trust the npm upgrading procedure a bit)
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))