Use the correct file package key so composer requires cache works

[andythorne]

Autoloading files is broken because composer requires the same file in the sub-package and root autoloaders. It does this because the fileIdentifier key is different due to the vendor path being included in the package name.

This PR normalises the package name so a consistent key can be generated, and the composer cache used when autoloading files.

Fixes #38

[beberlei]

Sorry have not seen this PR and the issue #38 before. I need to think about this a bit and check the Composer code to verify that the fix does what it should.

[beberlei]

This works, except when you have the laminas/laminas-zendframework-bridge that is loaded from friendsofphp/proxy-manager-lts, which will wrack havoc. I only solved it by adding a custom files autoloader that directly loads the Laminas classes and declares aliases:

<?php

require_once __DIR__ . '/vendor/laminas/laminas-code/src/Generator/GeneratorInterface.php';
require_once __DIR__ . '/vendor/laminas/laminas-code/src/Generator/AbstractGenerator.php';
require_once __DIR__ . '/vendor/laminas/laminas-code/src/Generator/TraitUsageInterface.php';
require_once __DIR__ . '/vendor/laminas/laminas-code/src/Generator/ClassGenerator.php';

class_alias("Laminas\Code\Generator\GeneratorInterface",
    "Zend\Code\Generator\GeneratorInterface");
class_alias("Laminas\Code\Generator\AbstractGenerator",
    "Zend\Code\Generator\AbstractGenerator",);
class_alias("Laminas\Code\Generator\TraitUsageInterface",
    "Zend\Code\Generator\TraitUsageInterface",);
class_alias("Laminas\Code\Generator\ClassGenerator",
    "Zend\Code\Generator\ClassGenerator",);

plus the following in root autoload:

    "autoload": {
        "files": ["laminas.php"]
    },