Corrected 'class' parameter

Corrected 'class' parameter

* code-style:
  fix php5.4 array syntax
  many phpcs fixes
  fix phpDoc LuaScriptBuilder build @throws
  returned back formatting language files
  code style. WHILE
  code style. FOR
  code style. FOREACH
  code style. operator IF
  @param, @var, @property and @return must declare types as boolean, integer, string, array or null
  short echo tags
  short array syntax

Advanced app: Username should be unique

* 'feature' of https://github.com/mongosoft/yii2:
  returned back formatting language files
  code style. WHILE
  code style. FOR
  code style. FOREACH
  code style. operator IF
  @param, @var, @property and @return must declare types as boolean, integer, string, array or null
  short echo tags
  short array syntax

Conflicts:
	extensions/apidoc/commands/RenderController.php
	extensions/apidoc/models/BaseDoc.php
	extensions/apidoc/models/Context.php
	extensions/apidoc/templates/bootstrap/Renderer.php
	extensions/apidoc/templates/bootstrap/layouts/guide.php
	extensions/apidoc/templates/bootstrap/layouts/main.php
	extensions/apidoc/templates/bootstrap/views/index.php
	extensions/apidoc/templates/html/Renderer.php
	extensions/apidoc/templates/offline/views/index.php
	extensions/apidoc/templates/offline/views/offline.php
	extensions/apidoc/templates/online/views/index.php
	extensions/elasticsearch/Connection.php
	extensions/redis/ActiveQuery.php
	framework/base/ErrorException.php
	framework/helpers/BaseFileHelper.php
	tests/unit/framework/helpers/FileHelperTest.php

Merge pull request #2622 branch 'ext-codestyle-fix' of https://github.com/AlexGx/yii2 into code-style

* 'ext-codestyle-fix' of https://github.com/AlexGx/yii2:
  fix php5.4 array syntax
  many phpcs fixes
  fix phpDoc LuaScriptBuilder build @throws

Conflicts:
	extensions/apidoc/commands/RenderController.php
	extensions/apidoc/models/BaseDoc.php
	extensions/apidoc/templates/BaseRenderer.php
	extensions/apidoc/templates/bootstrap/Renderer.php
	extensions/apidoc/templates/bootstrap/layouts/guide.php
	extensions/apidoc/templates/bootstrap/layouts/main.php
	extensions/apidoc/templates/html/Renderer.php
	extensions/apidoc/templates/offline/Renderer.php
	extensions/apidoc/templates/offline/assets/AssetBundle.php
	extensions/apidoc/templates/offline/views/index.php

Really not sure what this is. It seems incomplete as is.

issue #1797

Fixes #2629: `Module::controllerPath` is now read only, and all controller classes must be namespaced under `Module::controllerNamespace`

Apidoc refactoring

Fixes #2653: Fixed the bug that unsetting an unpopulated AR relation would trigger exception (qiangxue)

Fixes #2603: `yii\base\ErrorHandler` now extends `\ErrorHandler`