* [parser] Allow plugins to extend ScopeHandler
* Directly extend Scope
* Don't use new.target to get the ScopeHandler
* [parser] Add TS enum support to the Scope
* Remove duplicated options in tests
* Fix
* Fix flow
* Rename tests
* Add tests
* Full typescript support in scope
* Remove BIND_SIMPLE_CATCH
SCOPE_SIMPLE_CATCH was used instead
* Export TS types
* Register function declarations
* Fix body-less functions and namespaces
1) Move this.scope.exit() for functions from parseFunctionBody to the callers.
Otherwise the scope of body-less functions was never closed.
Also, it is easier to track scope.exit() if it is near to scope.enter()
2) Register namespace ids for export
* Disallow redeclaration of enum with const enum
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