Big refactoring continued. Migrating to package views and fragments.
Reimplemented non-trivial logic of ModuleConfiguration.
Removed ModuleConfiguration.
Removed ex-ModuleConfiguration classes.
Inlined method.
Removed namespaces from descriptor visitor.
Simplified BuiltinsReferenceResolver.
Removed obsolete classes.
Migrated CliLightClassGenerationSupport to package views.
Cleanup of CheckLocalVariablesTableTest
Removed obsolete code in codegen for 'var' parameters captured in closure. 'Var' parameters are forbidden now.