Turned sbt launcher into a general Scala application launcher as described in launch.specification

launch/interface/src/main/java/xsbti/AppProvider.java

@@ -1,7 +1,5 @@
 package xsbti;
 
-import java.io.File;
-
 public interface AppProvider
 {
 	public ScalaProvider scalaProvider();
@@ -10,6 +8,5 @@ public interface AppProvider
 	public Class<? extends AppMain> mainClass();
 	public AppMain newMain();
 
-	public File[] component(String componentID);
-	public void defineComponent(String componentID, File[] components);
-}
+	public ComponentProvider components();
+}

launch/interface/src/main/java/xsbti/ComponentProvider.java

@@ -0,0 +1,9 @@
+package xsbti;
+
+import java.io.File;
+
+public interface ComponentProvider
+{
+	public File[] component(String componentID);
+	public void defineComponent(String componentID, File[] components);
+}

launch/interface/src/main/java/xsbti/ScalaProvider.java

@@ -9,5 +9,7 @@ public interface ScalaProvider
 
 	public ClassLoader loader();
 	public File[] jars();
+	public File libraryJar();
+	public File compilerJar();
 	public AppProvider app(ApplicationID id);
 }