fixes strutils.unescape; refs #3634

tests/parser/tmultiline_comments.nim

@@ -0,0 +1,18 @@
+discard """
+  output: '''3'''
+"""
+
+proc main* =
+  ##[Mutltie akdlsf comment with #[nesting].
+  Yay, that is so cool.
+  ]##
+  echo "foo bar"
+
+var foo #[ Test the new inline comments ]#: int = 3
+##[ A
+novel documentation comment
+#[Nesting works to some extend]
+##[ Nested doc comment! ]##
+]#
+]##
+echo $foo