linting issues

[smokhov]

The current linting setup has a couple of issues:

• linting currently does not cover the test/ directory; I think it should
• ideally should provide a formatter like with --fix for PRs like Improvement when there is no explicit Body in the request #1196
• there are two config files (tslint.json and tsconfig.json), but it seems only one is used. I think one should include the other with the rules instead. This is here the main config is used:

  node-soap/package.json

  Line 36 in 7c38c03

  "lint": "tslint -p tsconfig.json",

[w666]

I am going to replace it with eslint and upgrade typescript version. This is in my backlog for some time already.

[w666]

I started working on this, about halfway through,
Probably will add a prettier config as well, but depending on my availability.