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
Built-in top-level functions are located in jet.namespace class.
JetStandardClasses.isStandardClass() now checks that a given fqName starts with
"jet.", instead of searching it in the standard scope, to prevent this kind of
errors in the future