@open-wc project template, tweaked to work with Typescript

The template sets up @open-wc/linting and @open-wc/testing.

To get running in a real project one will have to add other @open-wc templates by running npm init @open-wc

Changes compared to standard templates

• Linting
  • Adds standard
  • Semicolons disabled
  • Uses @typescript-eslint parser and config
  • Default Typescript indentation changed to 2 spaces
  • Ignore warnings from eslint (--quiet)
  • tsc --noEmit running as git hook
• Testing
  • Browserstack limited to a single concurrent job
• Typescript
  • Strict
  • Source in src directory to reduce clutter