brackets-eslint extension

[abose]

JShint integrated does not support private class vars.
eslint is preferred!
Add option to fix the linter issues

• [feat] Vertical rulers/guidelines for line char limit ux #1237 - set the rulers from eslint too

[abose]

UziTech/eslint-linter-browserify#254

[abose]

The ESLint extension is integrated with the native apps. However, there are some points to note:

• ESLint is not the default and will only be activated if the project specifies an eslint dependency.
• JSHint has improved user-friendly error messaging. For example, JSHint clearly indicates that a semicolon is missing, whereas ESLint throws a generic parsing error. Therefore, JSHint is preferred at this time.
• When the TS language service is implemented, we will switch to that.

For additional details, see:
#1682
#1668