Add MakerModel to generate domain models and related classes/resources (#13)

[b00gizm]

Adds a Maker command to generate

• The domain model class
• A repository class for the model
• The model's identity class as value object (optional)
• A Doctrine database entity configuration, either as annotation or separate config file (optional)
• A custom Doctrine type for the model's identity class (optional)

Command Output

Description:
  Creates a new domain model class

Usage:
  make:ddd:model [options] [--] [<name>]

Arguments:
  name                               The name of the model class (e.g. Customer)

Options:
      --aggregate-root               Marks the model as aggregate root
      --entity=ENTITY                Use this model as Doctrine entity
      --with-identity=WITH-IDENTITY  Whether an identity value object should be created
      --with-suffix                  Adds the suffix "Model" to the model class name

Checklist

• Add Maker command
• Generate model class
• Generate repository class
• (Optionally) inherit from AggregateRoot (--aggregate-root)
• (Optionally) generate model identity class as value object (--with-identity)
  • For numeric/integer ID
  • For UUID
• (Optionally) add Doctrine database entity configuration (--entity)
  • As attributes
  • As separate XML config file
  • Create custom Doctrine mapping types for model identity
    • For numeric/integer ID
    • For UUID
  • Update Doctrine configuration
• Handle custom paths/prefixes in case the user wants to use a different root directory than src/Domain/Model
• Add documentation
• Add test case

[b00gizm]

Doctrine's YAML driver is deprecated and will be removed from v3.0. Either replace with XML config generation or omit entirely and just focus on annotations (attributes).

Symfony's docs for configuring Doctrine ORM.

[janvt]

Handle custom paths/prefixes in case the user wants to use a different root directory than src/Domain/Model

@b00gizm The Symfony MakerBundle is very opinionated and does not allow an override of the directory, as fas as I know (just the namespace). So I don't think we need to support this...

[janvt]

Custom root path and tests will be tackled seperately outside of this PR.

[janvt]

Moved changeset to Maker Commands feature collection PR. #20
Closing this.