Add support for UltraLightScripts

compiler/testData/asJava/ultraLightScripts/FunsPropsAndFields.kts

@@ -0,0 +1,9 @@
+
+fun testFun(i: Int): String = i.toString()
+
+val testPropVal = 42
+
+var testPropVar = 42
+
+@JvmField
+val testField = 42

compiler/testData/asJava/ultraLightScripts/HelloWorld.kts

@@ -0,0 +1,2 @@
+
+println("Hello world!")

compiler/testData/asJava/ultraLightScripts/InnerClasses.kts

@@ -0,0 +1,11 @@
+class Bar(val a: Int) {
+    val b: Int = { 0 }()
+
+    fun getAPlusB() = a + b
+
+    class Baz {
+        fun doSomething() {
+
+        }
+    }
+}