string literals with embedded newlines

[cgay]

https://play.opendylan.org/shared/feae26a75c598856

define constant $template =
  """
    format-out("Hello, world!\n");

  """;

Open Dylan 2024.1
...play-6efce37c1178/main.dylan:8.3-51: Serious warning - Invalid multi-line string literal: "each line must begin with the same whitespace that precedes the end delimiter (got "\")", want "  ")"
        ------------------------------------------------
        """;
        ------------------------------------------------

I think the multi-line string literal handling just needs to remove the shared whitespace prefix before handling escape codes.