This PR adds support for the following new language features introduced in OTP-27.0-rc1:
- Triple-Quoted Strings has been implemented as per EEP 64 to allow
a string to encompass a complete paragraph.
- Adjacent string literals without intervening white space is now a syntax error,
to avoid possible confusion with triple-quoted strings.
- Sigils on string literals (both ordinary and triple-quoted) have been implemented as per EEP 66.
- For example, ~"Björn" or ~b"Björn" are now equivalent to <<"Björn"/utf8>>.
This PR adds support for the following new language features introduced in OTP-27.0-rc1: