Fix eslint violations (#2416)

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* Add more JS libraries to eslintignore

* eslint . --fix

Automatic fixes only

* frame.js: eslint fixes

* events.js: manual eslint fixes

* skin.js: manual eslint fixes

* watch.js: manual eslint fixes

* Remove some tabs used for indentation in JS

* state.js: Fix new-cap eslint violation

* Disable guard-for-in eslint rule to get everything passing

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