lifecycle events for projects (#2013)

config/services.yaml

@@ -20,7 +20,7 @@ services:
     # this creates a service per class whose id is the fully-qualified class name
     App\:
         resource: '../src/*'
-        exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php,Constants.php}'
+        exclude: '../src/{DependencyInjection,Entity,Event,Migrations,Tests,Kernel.php,Constants.php}'
 
     # controllers are imported separately to make sure services can be injected
     # as action arguments even if you don't extend any base controller class