Pyret IDE error rendering

[jpolitz]

• [ ] Implement components for error-display (highlights as prototype)
  • [ ] Especially CodeMirror snippet component
  • [ ] Also multi-highlighting, fixed highlighting (both modes)
  • [ ] Port callbacks for parsing, fetching AST information
  • [ ] Stored non-definitions modules for fetching source
• [ ] Hook up component creation in compile and parse entry points from runtimeAPI
• [ ] Interface with value rendering for nested value display (when necessary)