Add and use self-made ControllerResolver class to improve routes.yml file

Make it more elegant - drop loong namespaces
Extract class and method extraction to separate ->getStockClassAndMethod() to make code cleaner
Make all records to routes.yml correct, up to recent ControllerResolverStock
Update ControllerResolverStock to have default 'index' action
Declare ControllerResolverStock implements ControllerResolverInterface.

 Declare exception in docblock
Create Initializer class to hide details of initialization of doctrine, kernel and routes.

Move realization details from index.php to Initializer.

Add config file to hold constants.