findAllReferences inital port

[iisaduan]

This port focuses on the logic needed to resolving symbols within a single file.

Todos after this PR:

• Search for references through module resolving
• Search for references through imported and exported symbol resolving
  • Some imported and global symbols return references, but it is hard to test with the current lstestutil capabilities.
• Jsdoc references (not sure how much of the currently un-ported parts will be needed, since @sandersn has been working to simplify jsdoc checking)
• Special cases for object literals
• Special cases for classes and keywords
• String references