Scalajs-React updates (#1656)

* Scalajs-React: Reformat, drop C-prefix

* Scalajs-React: Convert to .sbt file, bump dependencies

* Scalajs-React: Capture event data and correctly focus input field

* Scalajs-React: Generate new files

examples/scalajs-react/build.sbt

@@ -0,0 +1,33 @@
+enablePlugins(ScalaJSPlugin)
+
+name             := "todomvc"
+organization     := "com.olvind"
+version          := "1"
+licenses         += ("Apache-2.0", url("http://opensource.org/licenses/Apache-2.0"))
+scalaVersion     := "2.11.8"
+scalacOptions   ++= Seq("-deprecation", "-encoding", "UTF-8", "-feature", "-unchecked", "-Xlint", "-Yno-adapted-args", "-Ywarn-dead-code", "-Ywarn-value-discard" )
+
+/* create javascript launcher. Searches for an object extends JSApp */
+persistLauncher  := true
+
+/* javascript dependencies */
+jsDependencies ++= Seq(
+  "org.webjars.bower" % "react" % "15.2.1" / "react-with-addons.js" minified "react-with-addons.min.js" commonJSName "React",
+  "org.webjars.bower" % "react" % "15.2.1" / "react-dom.js"         minified "react-dom.min.js" dependsOn "react-with-addons.js" commonJSName "ReactDOM"
+)
+
+/* scala.js dependencies */
+libraryDependencies ++= Seq(
+  "com.github.japgolly.scalajs-react" %%% "extra"   % "0.11.1",
+  "com.lihaoyi"                       %%% "upickle" % "0.4.1"
+)
+
+/* move these files out of target/. Also sets up same file for both fast and full optimization */
+val generatedDir = file("generated")
+crossTarget  in (Compile, fullOptJS)                     := generatedDir
+crossTarget  in (Compile, fastOptJS)                     := generatedDir
+crossTarget  in (Compile, packageJSDependencies)         := generatedDir
+crossTarget  in (Compile, packageScalaJSLauncher)        := generatedDir
+crossTarget  in (Compile, packageMinifiedJSDependencies) := generatedDir
+artifactPath in (Compile, fastOptJS)                     :=
+  ((crossTarget in (Compile, fastOptJS)).value / ((moduleName in fastOptJS).value + "-opt.js"))