Create an empty unit file, with no filename or path.

Load a unit file from disk, remembering the path and filename.

Unescape known escape sequences.

Don't treat multiple adjacent separators as one.

Ignore separators in quoting with "" and ''.

Allow unbalanced quote and eat up trailing backslash.

Treat escape character '\' as any other character without special meaning.

Do not advance the original string pointer past the separator(s) */.

Allow and keep unknown escape sequences, allow and keep trailing backslash.

Unescape separators (those specified, or whitespace by default).

Ignore separators in quoting with "" and '', and remove the quotes.