Do not report NO_CLASS_OBJECT when namespacesAllowed=true

Now with nested classes the expression "A.something" makes sense even when A
doesn't have a class object ("something" could be a nested class)

Also "A" expression now gets a NamespaceType with the scope of all static
nested classes of A

 #KT-1174 In Progress

idea/testData/javaFacade/ea38770.kt

@@ -1,3 +1,3 @@
-fun <T> foo() {
+fun <T> foo() where class object T : Any {
     T.<caret>toString()
 }