* Add TypeScript app creation

* Actually specify new extension

* Check for ts and tsx

* Fix types in default service worker file

* Mirror changes in JS version of SW

* Separate templates

* Use separate template directory

* Remove unused function

* Add a tsconfig file to the template

* Test install of typescript

* Add e2e for TypeScript

* Check for index.tsx to make sure we're not in the JS template

* Ensure TypeScript doesn't leak into normal installs

* Ignore some files

* Print version of CRA

* Fix script

* Add new template

* Move test to correct location

* Use `verifyTypeScriptSetup` routine to populate files

* Ensure tsconfig is created