Add logger class, rewrite and cleanup logging calls, and refactor generation workflow

[nickesc]

• adds a Logger that replaces previous console.log, console.error and console.warn calls
  • handles quiet/silent options
  • supports pre-styled logs
  • managed newlines to avoid duplicate blank lines
  • updates logging across the entire package to be consistent and look polished
• decouples readme and gitignore generation from lockfile generation (functions the same, but more modular as a package)
• adds option to generate license file during lockfile generation
• fixes duplicate license options
• standardizes function parameter naming
• adds Prettier configuration and applies formatting changes across the codebase

closes: #25

[nickesc]

looks good, update docs, bump version, and publish to npm