Convert to laminas-cli commands

[weierophinney]

This patch is a complete rewrite, while retaining the same functionality for end users of the command (albeit with different invocation).

First, it extracts a class, Composer, for operations around reading and parsing the composer.json file, adding and removing autoloading rules, writing changes to the file, and dumping autoload rules. The class uses several collaborators to do its work:

• FileReaderInterface performs the operation of reading the composer.json file.
• FileWriterInterface performs the operation of writing changes bacck to the composer.json file.
• AutoloadDumpInterface performs the operation of calling composer dump-autoload.

Each has exactly one implementation:

• FileReaderViaFileGetContents
• FileWriterViaFilePutContents
• AutoloadDumpViaSystemProcess

This approach makes testing the functionality far easier, as no actual filesystem operations need to be performed while testing.

The Command\Enable and Command\Disable classes were rewritten to Command\EnableCommand and Command\DisableCommand, respectively, and now inherit from a common symfony/console Command class extension, AbstractCommand. The AbstractCommand includes setup of common input options, input validation, and the logic for autodiscovery of the autoloader type to use.

The EnableCommand has an additional collaborator, MoveModuleClassFileInterface, which has the responsibility of moving Module.php files in the root of a module directory into its source subdirectory. This interface, like the others, has exactly one implementation, MoveModMoveModuleClassFileViaFileOperations.

A ConfigProvider and Module class allow exposing the commands via laminas-cli to MVC and Mezzio applications.

Fixes #4