Fix eslint violations (#2416)

* 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

.eslintrc.js

@@ -9,6 +9,7 @@ module.exports = {
     "brace-style": "off",
     "camelcase": "off",
     "comma-dangle": "off",
+    "guard-for-in": "off",
     "key-spacing": "off",
     "max-len": "off",
     "new-cap": ["error", {