lambda support

[lmorg]

Describe the problem:
Lambda code, [{}] is currently experimental and half implemented. They bring with them very handy techniques for quickly traversing objects and arrays and thus there is benefit in bringing that syntax into the stable language scheme.

Todo:

• array and scalar syntax should be equal
• objects should inline a $. object: { "key": str, "val": ... }
• arrays should inline a $. object: { "key": int, "val": ... }, where key is the iteration number
• any variables with a type of null should be treated as a zero length array
• any other variables of primitive types which are neither objects nor arrays should be treated as an array of length 1