Parse escaped quotes

[Ca-moes]

This Issue comes in addition to #2

ltsv can be used as a good option for parsing key values, but it has a problem that is also present in this repo.

If the string is escaped, the parsing is incorrect:

msg=\"unable to list rules\"

Becomes: msg=\"unable

If can also be from my part, because on my side the <source> escapes these inner characters, so it should be the parser's work to recognize them and set the boundaries for the value.