Add various plugin manager
Add untracked files
Add to service listener
Remove BC
Inject validator chain in input filter factory
Fix CS
Default validator and filter chains
Add initializable interface to input filter
Feedbacks
Set hydrators not shared by default
Merge pull request #4319 from bakura10/hydrator-plugin-manager

Add various plugin manager
[#4319] Fix tests

- Intention changed mid-PR, but tests were not updated; demonstrate that Factory
  composes a default filter chain and validator chain by default.
[#4319] Do not share input filter instances by default
Merge branch 'feature/4319' into develop

Close #4319