[RFC] Update the DEPRECATED.md file

[fritzmg]

I simply took the exact same wording from the trigger_error method here.

It would be useful to provide some examples - however PHP files do not seem to work there currently (#740).

[leofeyer]

The PR seems incomplete to me. There is also an initconfig.php file and a dcaconfig.php file, which are both deprecated, too. Shouldn't we add them all?

[fritzmg]

Agreed.

Am I right in assuming that any DCA changes should be done via app/Resources/contao/dca?

Not sure what to write about the initconfig.php though, other than it being deprecated.

[leofeyer]

Symfony provides a lot of useful events that can be used instead of the initconfig.php file.

[fritzmg]

Do you have a suitable example? I cannot think of a proper use-case for the initconfig.php right now anymore. I sometimes put things in there that could be done in the dcaconfig.php as well - but I chose to do it in the initconfig.php since it is only executed once.

[aschempp]

As far as I remember there is no Contao framework initialization event, but kernel.request might be used in most of the places for example.

[fritzmg]

I have updated the PR.

[leofeyer]

Merged in aae0a69.