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/subtitleeditor/subtitleeditor.js

@@ -192,8 +192,7 @@ define(['dialogHelper', 'require', 'layoutManager', 'globalize', 'userSettings',
         var lastLanguage = userSettings.get('subtitleeditor-language');
         if (lastLanguage) {
             selectLanguage.value = lastLanguage;
-        }
-        else {
+        } else {
 
             apiClient.getCurrentUser().then(function (user) {
 
@@ -347,8 +346,7 @@ define(['dialogHelper', 'require', 'layoutManager', 'globalize', 'userSettings',
 
         if (typeof itemId === 'string') {
             apiClient.getItem(apiClient.getCurrentUserId(), itemId).then(onGetItem);
-        }
-        else {
+        } else {
             onGetItem(itemId);
         }
     }