Various scala-2.13.0-M5 fixes

Clearer imports in TcpDnsClient

Accept SVG's when checking if diagrams were generated

Fix akka-actor MiMa issues

akka-testkit scalafix changes

Update scalatest to 2.13-released snapshot

akka-stream scalafix changes

Update ssl-config

To version that's released with -M5

Take elements directly out of buffer

Manually fix immutable.Seq / Doc link

Make sure the right Concat, Sink is imported

akka-stream binary compat

akka-stream-testkit scalafix

akka-actor-tests scalafix

Eta-expensions

akka-actor-tests/src/test/scala/akka/util/ByteStringSpec.scala

@@ -35,7 +35,7 @@ class ByteStringSpec extends WordSpec with Matchers with Checkers {
       for {
         chunks ← Gen.choose(0, s)
         bytes ← Gen.listOfN(chunks, genSimpleByteString(1, 1 max (s / (chunks max 1))))
-      } yield (ByteString.empty /: bytes)(_ ++ _)
+      } yield bytes.foldLeft(ByteString.empty)(_ ++ _)
     }
   }