Add parsing and AST work for ExportAssignment clauses.
Adding support in the parser and AST for new style enums.
Remove .actual files.
Adding support for overloading on a string constant.
Remove redundancy in the AST translator.
Adding explicit test for new style enums.
Adding parsing tests for export assignment clauses.
Updating the fidelity emitter to handle new style enums.

Properly deal with enums with string names, and also properly initialize the indexer function.