Upgrade to Scala 2.13.0

[lihaoyi]

Assuming we want to upgrade everything in lockstep, and not end up with a mix of 2.12.8 and 2.13.0 modules, the following dependencies are holding us back:

ivy"org.scala-sbt::zinc:1.2.5"
ivy"org.scalameta::scalafmt-dynamic:2.0.0-RC6"

ivy"com.typesafe.play::routes-compiler::2.6.0"
ivy"com.typesafe.play::routes-compiler::2.7.0"

ivy"ch.epfl.scala::bloop-config:1.2.5"
ivy"com.lihaoyi::ujson-circe:0.7.4"

ivy"org.scala-native::tools:${scalaNativeVersion()}"
ivy"org.scala-native::util:${scalaNativeVersion()}"
ivy"org.scala-native::nir:${scalaNativeVersion()}"
ivy"org.scala-native::nir:${scalaNativeVersion()}"
ivy"org.scala-native::test-runner:${scalaNativeVersion()}"

ivy"org.scala-js::scalajs-tools:0.6.22"
ivy"org.scala-js::scalajs-sbt-test-adapter:0.6.22"
ivy"org.scala-js::scalajs-js-envs:0.6.22"

ivy"org.scala-js::scalajs-tools:1.0.0-M2"
ivy"org.scala-js::scalajs-sbt-test-adapter:1.0.0-M2"
ivy"org.scala-js::scalajs-env-nodejs:1.0.0-M2"
ivy"org.scala-js::scalajs-env-jsdom-nodejs:1.0.0-M2"
ivy"org.scala-js::scalajs-env-phantomjs:1.0.0-M2"

There's not a huge urgency to upgrade, but just leaving the list of dependencies here so when they do end up upgrading, we can keep track and eventually upgrade Mill

CC @sjrd @jvican @densh @olafurpg as the owners of the various projects, no idea who owns the play routes compiler, maybe the lightbend folks

[woyzeck]

Hi, it's been a while now since Scala 2.13 was released. Are there any updates to this issue ?