classes declaration:

fix: class of the same unqualified name in package inside module (see MultiFileTest.testClassOfTheSameNameInAnotherPackage)

We don't ever try to use meaningful var name for temp class declaration — we remember about incremental compilation  inline final class declaration don't generate scope function if we don't need it

failed and fixed test: fast fix Kt817 (we must investigate, actually, it seems dart ast bug — we must have ability to declare name in our scope without check the same name in the parent scope)

perfomance: delete ClassSortingUtils, we don't need it

js/js.translator/testFiles/multiFile/cases/classOfTheSameNameInAnotherPackage/A.kt

@@ -0,0 +1,7 @@
+package foo
+
+open class A() {
+    fun f() = 3
+}
+
+fun box() = (A().f() + bar.A().f()) == 9

js/js.translator/testFiles/multiFile/cases/classOfTheSameNameInAnotherPackage/B.kt

@@ -0,0 +1,5 @@
+package bar
+
+open class A() {
+    fun f() = 6
+}