Package Manager

Create a package manager to allow reuse of components.

Requirements:
- Track individual versions for each package.
- Package dependency should be tracked within a package so multiple versions can be used across multiple packages (?)
- Interface within the application.
- Simple flat file format similar to Bundler's Gemfile.

The issue names no files, tests, or entry points. Start by surveying the repository for component loading and application-interface code, then compare the proposed flat format with Bundler's Gemfile. Done means versioned packages, package-local dependency tracking that permits multiple versions, and an in-application interface.

Written by the indexing model from the issue text.