Fixes #2775: Added `yii\base\Application::bootstrap` to support running bootstrap classes when starting an application

Adds DateTimeInterface support for Formatter

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

Changed `Controller::afterAction()`, `Module::afterAction()` and `ActionFilter::afterAction()` to pass `$result` by value instead of reference

call hasMethod() instead of using method_exists

Fixed typo in runWithParams