Undeclared Altis core dependency breaks composer updating

[tomjn]

Previously there was an issue where local server became dependent on Altis Core, but the package was undeclared: #501 This is not the same problem, but a consequence of the resolution implemented.

The resolution for this was not to declare the dependency as a dependency though, and an alternative method was used.

Now, when upgrading the Altis local server package, because v13 still doesn't declare Altis core as a dependency it isn't installed and the command fails with the warning that was added to resolve that issue.

However, this also puts the project in a limbo state where the required package cannot be installed. All attempts to install altis/core via composer commands fail as the previous resolution interrupted package installation/removal processes.

The immediate result is that it tries to scan the local server package folder for files to autoload but fails because it was removed, then suffers a hard crash because it can't load wp-config.php from the package folder.

So now I'm stuck, to install altis/core I need to install altis/core. Fixing this forced me to nuke my vendor folder.

Steps to reproduce:

1. Install Local Server v11 or a version that did not require Altis core
2. Attempt to upgrade local server and encounter the problem in Call to undefined function Altis\get_config() #501
3. Add altis/core to composer.json
4. Attempt to composer update to install the new packages and upgrade the old ones