- Linting: Lint hidden ncurc.js file

- Docs: Add 6.0.0.md migration file
- Docs: Update Contributing, Testing (renamed to Development), Linting and ReleaseInstructions
- Docs: Info on submodules
- npm: Add scripts for updating submodules
- npm: Add `license-badges`, `build-docs`, and `copy` scripts to `prepublishOnly` script
- npm: Bump to 6.0.0

docs/Contributing.md

@@ -18,7 +18,7 @@
     dependency's updated new API
   - `Refactoring: `
   - `Linting (<type>):` - Linting by type, e.g., "ESLint"
-  - `Testing:`
+  - `Testing (<UI|Unit>):`
   - `Build: `
   - `npm` - Updates to dependencies, npm version, etc.
 1. See [`Testing.md`](./Testing.md) for other information helpful for contributing.