Fix parsing of quoted keys

[dhrdlicka]

Goal

Closes #19

Background

Some INF files use keys with quote characters, e.g. InfHelperTests/infs/oem160.inf:

"Realtek High Definition Audio" = IntcAzAudModel, HDAUDIO\FUNC_01&VEN_10EC&DEV_0257&SUBSYS_17AA39F5 ; ThinkBook 16p NX ARH

Under the current implementation, the parser incorrectly parses the key as a value, ending up with a Key object like this:

[null] = {"\"Realtek High Definition Audio\"", "=IntcAzAudModel", "HDAUDIO\FUNC_01&VEN_10EC&DEV_0257&SUBSYS_17AA39F5"}

Implementation

I added a check to the closing quote handler, which returns to key ID parsing if the currently processed key does not have one yet. I also made sure the key parsing is finished upon encountering a quoted value terminated by a newline (#16)

Testing

I added a new QuotedKeyParsingTest test that checks for this.

[skalahonza]

@dhrdlicka thank you for your contribution
I will merge this PR and draft a new nuget release in no time

[skalahonza]

https://www.nuget.org/packages/InfHelper/0.14.1