[NFR]: Show the model names: config:show and the old files of a renamed class #71

crest config:show does not show the models key of crest.php (#53). When a new models.classes line gives a table with a model another class, crest writes the new pair, and says nothing about the old pair.

Scope

• config:show, in an MVC project: models.camelCase (the value, and declared or default) and a table of the models.classes lines (table, class). A wrong models value does not stop config:show: its row shows the error, and make:model still stops on it.
• make:model: when the class of a table comes from models.classes, and the base of the default class of the table (<Class>Base.php, with the crest marker) exists, a Note line names the old pair, and tells the user to move the code and delete the old files. crest deletes nothing.
• Docs: crest does not make singular class names (users gives Users); a classes line gives one.

Open

• The text of the Note line.

Done when

• In an MVC project with a models key, crest config:show shows camelCase and each classes line, with the origin.
• After 'users' => 'User' is added for a table with a model, crest make:model users prints the Note line for Users.php and UsersBase.php.

Part of #11. Depends on #53.