Export play-grpc to the play org

This code has been exported out of the akka-grpc repository into
https://github.com/playframework/play-grpc.

The last release from this repo was:

    com.lightbend.akka.grpc : akka-grpc-play-testkit : 0.4.2

This is now available from the play-grpc repo as:

    com.lightbend.play : play-grpc-testkit : 0.5.0-M5

(Still need to sync it from JCenter to Maven Central.)

... and I just realised that I need to change the package from
akka.grpc.play to something else... Will do!

build.sbt

@@ -161,96 +161,6 @@ lazy val interopTests = Project(
     }
     )))
 
-lazy val playTestdata = Project(
-    id="akka-grpc-play-testdata",
-    base=file("play-testdata")
-  )
-  .settings(Dependencies.playTestdata)
-  .settings(commonSettings)
-  .settings(
-    crossScalaVersions := Seq(scala211, scala212),
-    ReflectiveCodeGen.generatedLanguages := Seq("Java", "Scala"),
-    ReflectiveCodeGen.extraGenerators := Seq(
-      "ScalaMarshallersCodeGenerator",
-      "akka.grpc.gen.scaladsl.play.PlayScalaServerCodeGenerator",
-      "akka.grpc.gen.scaladsl.play.PlayScalaClientCodeGenerator",
-      "akka.grpc.gen.javadsl.play.PlayJavaServerCodeGenerator",
-      "akka.grpc.gen.javadsl.play.PlayJavaClientCodeGenerator",
-    ),
-  )
-  .enablePlugins(akka.grpc.NoPublish)
-  .pluginTestingSettings
-
-lazy val playTestkit = Project(
-    id="akka-grpc-play-testkit",
-    base = file("play-testkit")
-  )
-  .dependsOn(runtime)
-  .dependsOn(playTestdata % "test")
-  .settings(Dependencies.playTestkit)
-  .settings(commonSettings)
-  .settings(
-    crossScalaVersions := Seq(scala211, scala212),
-  )
-  .pluginTestingSettings
-
-val playSpecs2 = Project("akka-grpc-play-specs2", file("play-specs2"))
-  .dependsOn(playTestkit, playTestkit % "test->test")
-  .settings(
-    commonSettings,
-    crossScalaVersions := Seq(scala211, scala212),
-    Dependencies.playSpecs2,
-  )
-  .pluginTestingSettings
-
-val playScalaTest = Project("akka-grpc-play-scalatest", file("play-scalatest"))
-  .dependsOn(playTestkit, playTestkit % "test->test")
-  .settings(
-    commonSettings,
-    crossScalaVersions := Seq(scala211, scala212),
-    Dependencies.playScalaTest,
-    excludeFilter in (Compile, headerSources) := {
-      val orig = (excludeFilter in (Test, headerSources)).value
-      // The following files have a different license
-      orig || "NewGuiceOneServerPerTest.scala" || "NewServerProvider.scala" || "NewBaseOneServerPerTest.scala"
-    },
-  )
-  .pluginTestingSettings
-
-lazy val playInteropTestScala = Project(
-    id="akka-grpc-play-interop-test-scala",
-    base = file("play-interop-test-scala")
-  )
-  .dependsOn(playSpecs2 % Test, playScalaTest % Test)
-  .settings(Dependencies.playInteropTestScala)
-  .settings(commonSettings)
-  .settings(
-    ReflectiveCodeGen.extraGenerators := Seq(
-      "ScalaMarshallersCodeGenerator",
-      "akka.grpc.gen.scaladsl.play.PlayScalaServerCodeGenerator",
-      "akka.grpc.gen.scaladsl.play.PlayScalaClientCodeGenerator"
-    ),
-  )
-  .enablePlugins(akka.grpc.NoPublish)
-  .pluginTestingSettings
-
-lazy val playInteropTestJava = Project(
-    id="akka-grpc-play-interop-test-java",
-    base = file("play-interop-test-java")
-  )
-  .dependsOn(playSpecs2 % Test, playScalaTest % Test)
-  .settings(Dependencies.playInteropTestJava)
-  .settings(commonSettings)
-  .settings(
-    ReflectiveCodeGen.generatedLanguages := Seq("Java"),
-    ReflectiveCodeGen.extraGenerators := Seq(
-      "akka.grpc.gen.javadsl.play.PlayJavaServerCodeGenerator",
-      "akka.grpc.gen.javadsl.play.PlayJavaClientCodeGenerator",
-    ),
-  )
-  .enablePlugins(akka.grpc.NoPublish)
-  .pluginTestingSettings
-
 lazy val docs = Project(
     id = "akka-grpc-docs",
     base = file("docs"),
@@ -311,12 +221,6 @@ lazy val root = Project(
     sbtPlugin,
     scalapbProtocPlugin,
     interopTests,
-    playInteropTestJava,
-    playInteropTestScala,
-    playTestkit,
-    playSpecs2,
-    playScalaTest,
-    playTestdata,
     pluginTesterScala,
     pluginTesterJava,
     docs,