Add support for implicit controllers (no Request type hint, no Response)
Short array syntax
Remove Request and Response use statements from implicit-controller example
Split implicit controller into request param and string response listeners
Remove unused use statement
Merge branch 'implicit-controller'

* implicit-controller:
  Remove unused use statement
  Split implicit controller into request param and string response listeners
  Remove Request and Response use statements from implicit-controller example
  Short array syntax
  Add support for implicit controllers (no Request type hint, no Response)
Add functional tests covering request parameter and string response listeners