Ambient class declarations are not emitted so dont emit extends clause if its coming only from ambient class declaration
Some tests from spec review
Delete duplicate tests
Remove deleted baselines
Better parser recovery when a user types a lambda with an accessibility modifier in it.
No need to normalize the filename slashes here.  THey'll already have been normalized above.
Rename methods.
Move code related to emitting out of the AST nodes and into the emitter.

AST nodes should only be data elements.  As much as is possible, they
should not contain any logic of their own.
Reduce duplication in the emitter code.
Move more emit logic out of AST into the emitter.
Removing dead code.
Add typechecker to rwc codebase
Add option to skip the type check.
Fix encoding
Rename testcase
Overload resolution and several crash fixes
Update fidelity tests
Resolve declared symbol cleanup
Fix the emit of name when it comes from merged module declaration
Some import declaration emit cleanup