Handles the .horde.yml and changelog.yml file formats.

The .horde.yml format is the source of truth for composer.json generation and other package meta information.

• PHP Libraries - "library", Standard Composer libraries (PSR-0, PSR-4)
• Horde Libraries - "horde-library", libraries with horde-specific handling in the horde/horde-installer-plugin (PSR-0, PSR-4)
• Horde Applications - "horde-application", Horde framework applications
• Applications - "application", composer default application type
• PHP Extensions - "extension", C extensions distributed via PIE (PHP Installer for Extensions)
• Themes - "horde-theme", Horde themes
• Composer Plugins - Composer plugins

Format documentation is available at doc/FORMAT.md.

Same or similar implementations existed in:

• horde/horde-installer-plugin Composer plugin
• horde/components Developer CLI
• horde/hordectl Admin CLI

Refactoring into a separate library facilitates reuse.