- Also add hammer-parse-apply to readme

- HDoParseRetBreakpoint wasn't calling top_level_parse.return_from_h_do_parse()
- Fixed KeyError in return_from_h_do_parse()
- Print parser stack and input preview after apply, as with hammer-parse-step

Printing failed when stopped in h_do_parse with a parser whose type hasn't been resolved yet

- Stops when the HParsedToken is returned
- prints AST
- attempts to continue to the next h_do_parse invocation

- fix else if -> elif
- Move hammer-based type lookups to runtime
  - Hammer types can't be looked up at load time, since the library is not loaded yet

- ASTManager helper class to hold the top node of the ast to be printed
- HDoParseRetBreakpoint
- ast printing commands
- Update BreakpointManager tests with HDoParseRetBreakpoint tests
- Add support in TopLevelParse to select a stack item for printing the AST node of

It has been moved to top-level-parse.py

Fix breakpoint_manager not using its own retq finding function