Unescape all single quotes in raw string literals

[n0liu]

Raw string literals currently unescape only their first escaped single quote. For example, a filter matching O'Reilly's book against a raw string containing two escaped quotes returns no matches because the second backslash remains in the value.

Use a global replacement in _consumeRawStringLiteral so every escaped single quote is unescaped. Other raw escapes remain untouched. Add six compliance cases covering multiple and consecutive quotes, quotes at both ends, preserved newline/Unicode escape text, separate raw literals, and a filter expression.

Fixes #98.

Validation (Node 22.21.1):

• All six new cases fail against the unmodified base.
• npm test: 894 passing.
• Grunt default tasks: Uglify, JSHint, and ESLint passed.
• The generated minified build passes all six new cases.