Major changes:
1) Instead of skipping undesirable scopes, include them and mark them
with errors. Constants can be extracted into more scopes.
2) Update the tests to call through the "public" API. This caused some
baseline changes.
3) Rename refactoring to "Extract Symbol" for generality.
4) Return a second ApplicableRefactorInfo for constants. Distinguish
the two by splitting the action name.
* extractMethod: Support renameLocation
* Add tslint disable
* Properly analyze list of changes to always get a correct rename location
* Update test
* Ensure name is really unique
* Improvements to test code
* Respond to PR comments
* Test for action description of code actions, and simplify description for extracting method to file
* Add unit test file missing from tsconfig.json (only affects gulp) and update tests
* Use the actual number
* Use "module scope" or "global scope" instead of "this file"
