.properties Parser and Stringifier

The `properties` package provides a comprehensive parser and stringifier for Java-style `.properties` files, including support for extended features such as INI-like sections, variable expansion (including references to environment variables), dot-separated namespaces, and file import directives. The current stable version is 1.2.1. Although the README once implied active development, the package's last update was over nine years ago, and its `engines.node` requirement (>=0.10) indicates it targets very old Node.js environments, suggesting it is now abandoned. It distinguishes itself by not only adhering to the core Java `.properties` specification but also by offering powerful, opt-in enhancements that allow for highly structured and dynamic configuration management, going beyond basic key-value pair parsing.