update Hooks to Symfony 5

[craigh]

This includes temporary example files in /App and modifies the following files in order to achieve those:

These files should be changed back when testing is complete.

• composer.json
• config/services.yaml
• config/routes/annotations.yaml

These files should be removed:

• src/Controller/TestHookController.php (the template file for this controller is not included)
• src/HookEvent/*
• src/HookListener/*
• src/Form/*

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	YES
Fixed tickets	@see linked issues
Refs tickets	@see linked issues
License	MIT
Changelog updated	yes

Todos

• Tests - for HookLocator, Connection?
• Documentation
• Changelog
• Code
  • add ConnectionPostChangeEvent
  • fix installer to include new code (check HookBundleInstaller and CoreInstallerListener)
  • update HooksListener to add link to new UI
  • adapt ModuleInstallListener to new code (what happens if code not in an extension?)
  • move example code from App to docs

[craigh]

[Guite]

Two questions:

1. How is the connection entity's table going to be created if the hook bundle will be used in a non-Zikula environment? Flex recipe? Auto detection? (of course this is outside of this PR).

2. Do you have considered a place in UI where the user can see the summary/information about a hook (like described in [HookBundle] Helppage for each Hook #4398)? Didn't find it.

Otherwise go for it 👍 👍 🍰 🥇

[craigh]

How is the connection entity's table going to be created if the hook bundle will be used in a non-Zikula environment? Flex recipe? Auto detection? (of course this is outside of this PR).

There is a new schema:create command in this PR that could be used, but ultimately, that would be the problem of the developer implementing it..

Do you have considered a place in UI where the user can see the summary/information about a hook (like described in #4398)? Didn't find it.

There is a list under the UI with all the HookEvents and HookEventListeners.