interpret class in class object as static nested class

removed hack in TaskPrioritizer for import class from class object

compiler/testData/diagnostics/tests/classObjects/importClassInClassObject.kt

@@ -0,0 +1,11 @@
+package f
+
+import f.A.B
+
+class A {
+    class object {
+        class B
+    }
+}
+
+fun test() = B()