Use npm pack programatically to:

1. Download a meta-package from anywhere NPM can download from (NPM, github, support for version & tags, etc)
2. Merge the meta-package's package.json with the one of the newly bootstrapped project
3. All other files just go in (and overwrite existing one if needed)

Command could look like:

npm install mage/mage --bootstrap --prefix my-newgame --template wizcorp-mage-tpl
npm install mage/mage --bootstrap --prefix my-newgame --template stelcheck/mage-tpl#features/yolo

We could even eventually allow for compositing; an alternative UI for this could be:

npm install mage/mage --bootstrap --prefix my-newgame
cd my-newgame
npm run add-template stelcheck/mage-sca-tpl
npm run add-template stelcheck/mage-mocha-tpl
npm run add-template stelcheck/mage-gitlab-tpl

@AlmirKadric @ronkorving @christopherobin Would love to hear your thoughts on this one.

Refs

npm/npm#4074