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()

compiler/testData/diagnostics/tests/enum/starImportNestedClassAndEntries.kt

@@ -21,4 +21,4 @@ fun f1() = ENTRY
 fun f2() = ANOTHER
 fun f3() = Nested()
 fun f4() = Nested.foo()
-fun f5() = values()
+fun f5() = <!UNRESOLVED_REFERENCE!>values<!>()