properties-file parser & editor

The `properties-file` library provides a high-performance, lossless parser, editor, and formatter for Java-style `.properties` files. Currently stable at version 5.0.4, it undergoes active maintenance with frequent releases (multiple patches per month based on recent history). A key differentiator is its lossless data model, preserving comments, blank lines, and duplicate keys, allowing for exact reconstruction or normalized output via `format()` options. It boasts 3–7x faster parsing than alternatives, zero dependencies, and a tiny bundle size (970 B min+gzip for `getProperties`). Compiled to ES5, it offers broad compatibility, running on Node.js versions back to 0.4.0 and any modern browser. It also includes bundler integrations for Webpack, Rollup/Vite, esbuild, and Bun to import `.properties` files directly.