Review design of Controller models in CLI

[spalladino]

• Consider using composition instead of inheritance to account for the differences between app and lib controllers.
• Consider unifying the API of Package.js and App.js in zos-lib so they are more compatible with each other, and potentially reusing Package from App.
• Consider removing deployment checks out of the NetworkController to a separate contract verifier (see this thread).

[spalladino]

Consider unifying the API of Package.js and App.js in zos-lib so they are more compatible with each other, and potentially reusing Package from App.

See PackageAtVersion model