WIP: Fix to autoload if console is installed globally or within project

[s3than]

Issue

Add's a check to the autoload to check whether drupal console is installed globally or within the project itself.

[jmolivas]

@s3than Thanks for the PR. this PR fixes the autoload when installing DrupalConsole via composer global require?

[s3than]

I'm in the process of checking multiple install moment

1. composer require drupal/console (with default bin location)
2. composer require drupal/console (with custom bin location)
3. composer require drupal/console (with custom bin location and custom core location)

If you would like to label as WIP I'll advise once I've completed the installs and tests.

[jmolivas]

I will merge this to work on the --root discovery for this repo as in the Drupal Console Launcher https://github.com/hechoendrupal/drupal-console-launcher/blob/master/bin/drupal.php#L33