I have recently created a cross-platform, fully-managed configuration file reader / writer
It's still 0.2.x version, so pretty unstable, but it already has some great features (listed below)
I would like to have some feedback from the community. Feel free to open issues, create PRs etc

Customization

• customizable encoding (most encodings can be auto-detected)
• customizable culture
• customizable number styles (e.g. currencies, exponential notation etc)
• customizable line endings (usually auto-detected)
• customizable true and false (e.g. "verum" / "falsum" )
• customizable comment characters
• customizable key/value separator (defaults to '=')

Read and preserved

• file header comments
• config files with no sections (like in this [SectionName]) or even mixed: first section has no header, just keys
• comments in general
• section comments
• empty lines
• indented sections
• indented keys
• indented values

Values

• default values
• multi-line values (both quoted and not)
• quoted values
• null values (value-less keys)
• array values
• fancy float / double
• byte-encoded values
• smart boolean values (0/1, on/off, enabled/disabled work of the box)