Implement a 'travel' script type

[jdalley]

It might be useful to have a type of script with a different notation for inputting a terse, comma-delimited list of directions for getting from point A to B.

{
  "directions": "e-5, s-10, e-4, n-3, se-2, up, 2 door, down",
  "scriptType": "travel"
}