Iterate over group entries - may be key-value pairs as well as comments or empty lines.
Name of group being parsed (without brackets). Note: This can become invalid during parsing the Input Range (e.g. if string buffer storing this value is reused in later reads).
Original line of group header (i.e. name with brackets). Note: This can become invalid during parsing the Input Range (e.g. if string buffer storing this value is reused in later reads).
Object representing single group (section) being parsed in .ini-like file.