Make commands lazily loaded

[kefzce]

This is just a fix of the previous PR #641

More info by link doctrine/migrations#839

[za4me]

LGTM!

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed in a week if no further activity occurs. Thank you for your contributions.

[malarzm]

Thank you for the PR and for patience while I was getting to it! Beside one minor styling change would you mind targeting the 4.2.x branch? The change is an improvement that we'll be happy to release as a bugfix, but it's time we sunset 3.x series.

[kefzce]

Thank you for the PR and for patience while I was getting to it! Beside one minor styling change would you mind targeting the 4.2.x branch? The change is an improvement that we'll be happy to release as a bugfix, but it's time we sunset 3.x series.

That makes sense to me, sure.
Later today I will rename my branch to 4.2.x and rebase PR from 4.2.x target

[kefzce]

Add missing spaces & mark conversation as resolved, btw
@malarzm should I also fix CI by duplicate

    /**
     * @var string|null
     */

notation of inherited \Symfony\Component\Console\Command\Command?
If so, your Travis also tell me that you prefer single line notation instead, or it's just fine?)

[malarzm]

@kefzce one-line notation is the way to go, but also if you add it in a normal way phpcbf should be able to fix it for you (it's in vendor/bin/ folder). In general we need to have a green light from CI to merge a PR :)

[malarzm]

Awesome, thank you @kefzce!