Improved types map behavior

* Add new tsserver commandline option `--typesMapLocation filename.json`
* Types map looks like this:
```
{
  "typesMap": {
    /* the current hardcoded thing */
  }
  "simpleMap": ["jquery", "lodash", "leftpad", ...]
}
```
* Apply this logic to configured and inferred projects (not just external)

/cc @billti 