Support disabled escaping in templates

[stdweird]

See quattor/pan#35
Required steps

• detect disabled escaping and select noop escape functions (or make it a noop)
  • we could also implement a reversible escape method as a first step towards real noop
• support switching between profiles from cache that have enabled escaping and ones without
• allow path selection using "/a/b/{/c/d/}/f", not sure if this used much, but constructing a path will require a method to distinguish the previously escaped path
• also printing current path should generate this output