Packages plugin issues

[Tlacenka]

• [x] Should the version not be the normalized <major>.<minor>.<patch> but e.g. exotic, the plugin throws. The occurrence should be filtered out instead. Use semver package to deal with these.
• [x] The Yarn v1 outdated data has a dynamic structure. The plugin currently considers it static.
• [x] The adapters for package manager support are now implemented in a declarative way. Instead, providing an object per package manager with its data in one place is more maintainable.
• [x] When effects is empty and isDirect is false for NPM, empty direct dependency is passed.
• [ ] Outdated score is now a ratio between total outdated and total major dependencies. It should be a ratio between total dependencies (both up-to-date and outdated) and major outdated. E.g. via npm ls --all --parseable for npm.