Update sbt-scalajs to 1.0.0

[scala-steward]

Updates org.scala-js:sbt-scalajs from 0.6.32 to 1.0.0.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Have a fantastic day writing Scala!

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scala-js", artifactId = "sbt-scalajs" } ]

labels: sbt-plugin-update, semver-major

[ashawley]

There will be conflicts with #405 when it's merged.

[ashawley]

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

I'm tempted to wait to see what happens about the conflicts, but this update will require a lot more changes in the project than these.

[SethTisue]

opened #408 to track it, to perhaps attract a volunteer, etc