CLI command to create a sprinkle

[lcharette]

The goal of this command is to create an empty Sprinkle and setup everything automatically.

A sprinkle-skeleton repo could be used as a base for a new sprinkle. This repo should contain the basic folder structure.

The workflow of the create-sprinkle command would be :

• Clone skeleton repo using composer create-project command (requires composer php class)
• Setup the sprinkle composer.json with the name and such
• Add the new sprinkle to sprinkles.json (This will requires CLI command to manage sprinkle  #728)
• composer update then bakery bake

The command would ask, if not already defined using optional options:

• Sprinkle name
• Sprinkle vendor
• Sprinkle folder name

Different skeleton repo could also be used depending what the dev wants to create.

[alexweissman]

We could definitely use this sooner rather than later. We're seeing a lot of people in chat who are getting hung up issues related to in-adherence to the naming conventions. This command would ensure that directories and namespaces are being named properly and probably save every newbie hours of headache.

[lcharette]

UF5 is now created with a skeleton repo; It doesn't require a bakery command, as it's done via composer.