adjust parsing of directives to preserve line/column info #1789
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Fixes #1788. Instead of prefixing the directive value with spaces to put it at the index into the string that it is in the template (which obviously breaks line numbers in error messages), just use the portion of the template string itself up to the end of the directive value. This also means we don't have to maintain the directive's value in a string as we march over it - we're just looking for the end of the attribute so we can trim everything after that off so as to not upset Acorn.