Change stdlib length function to use Scala .size() method on lists.
Change stdlib length function to use Scala .size() method on lists.

Scala methods should probably be used to implement the standard
library when possible. This was just the one that was actually a
problem for me. We may also just deside to make this all go away
when we revamp the standard library for objects.

orc-lang/orc,orc-lang/orc,orc-lang/orc,orc-lang/orc,orc-lang/orc