add a composite build for atrium-scala

in order that this works we have to refactor a bit:
- rename project atrium in directory scala to atrium-scala
  (also rename the directory to atrium-scala)
- rename api project accordingly (i.e. move files)

.github/workflows/java-windows.yml

@@ -46,6 +46,10 @@ jobs:
                 run: ATRIUM_ANDROID_JAR="$PWD/android-jar-cache/android.jar" ./gradlew checkDexer
                 shell: bash
 
+            -   name: composite build atrium-scala
+                run: ./gradlew build
+                working-directory: misc\tools\atrium-scala-test
+
             -   name: Upload windows build code coverage
                 uses: codecov/codecov-action@v1
                 env: