Fix bug where internal unquoted whitespace truncates values #205
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Reported in #204
The new parser for multiline values incorrectly truncates unquoted lines with internal whitespace.
There was no test for this previously so was "undefined" behaviour, but given we use https://github.com/bkeepers/dotenv as our "standard", it works there so it should work here.
Once getting deeper into the fix, I discovered not all tests had been moved over to the new parser and some dead code had been left in the package. I've now fixed all that up and got (almost all) original tests passing.
I cut two tests (allowing unterminated quoted variables) as they didn't match any rspec in ruby's dotenv.