Ruby

[ruby/prism] Further refine string handling in the parser translator

Mostly around newlines and line continuation.

• percent arrays need special backslash handling in the ast
• Fix offset issue for heredocs with many line continuations (used wrong variable as index access)
• More refined rules on when to simplify string tokens
• Handle line continuations in squiggly heredocs
• Correctly dedent squiggly heredocs with interpolation
• Consider ':foo: and %s[foo] to not be interpolation

https://github.com/ruby/prism/commit/4edfe9d981