Add some linting rules for the CI (#587)

* enable one-var rule

* enable indent rule

* enable no-multiple-empty-lines rule

* enable no-empty rule

* enable no-trailing-spaces rule

* enable no-extra-semi rule

* add eslint rules to fix block spacing

* enable max-statements-per-line rule

* enable brace-style rule

* fix some spacing issues and add future rules

* add code suggestions

src/components/tabbedview/tabbedview.js

@@ -101,8 +101,7 @@ define(['backdrop', 'mainTabsManager', 'layoutManager', 'emby-tabs'], function (
 
         if (!currentTabController) {
             mainTabsManager.selectedTabIndex(this.initialTabIndex);
-        }
-        else if (currentTabController && currentTabController.onResume) {
+        } else if (currentTabController && currentTabController.onResume) {
             currentTabController.onResume({});
         }
     };