Added a post-pass at the end of pass 0 that calls resolve_names for all contexts.
- This ensures that all the symbol tables of all parent contexts have been fully created before calling resolve_names.
- Created StcApp.lambda_dict.
- Created StcApp.all_contexts generator.
- Moved resolve_names from P0 to StcApp and slightly revised resolve_names.
- All helpers of StcApp.run now report their own timing statistics.  This simplifies run considerably.
- Use a global lambda count.