Replace package database with independently installed package repositories
- Add support for fetching and installing from package repositories containing package URLs and metadata
- Support multiple package repository sources
- Add new repo command
- Remove submit command
- Enhance describe and search commands
- Fix and improve help text for new and adjusted commands
- Fix bundle install exit status
- Refer to plugins as "plugins" instead of the general term "packages"
- Code clarity improvements
- Put plugin/theme distinction into package metadata
This updates omf plugin to new architecture, moving
functions to `functions` directory. It also revamps the
separation of concerns between CLI and underlying
implementations, organizing them into directories,
whose are autoloaded in plugin startup.
