Feature request: Add a form |apply-vector|

[adam-7]

Like |apply| but second argument is a vector.

(apply-vector + '#(1 2 3)) = (+ 1 2 3)

Nice for performance-hungry situations where guaranteed memory locality and slightly higher memory density of vectors is of use.

Asking for this in Gambit's runtime as this one must be there because it's a lowlevel primitive and cannot be implemented in user library code, especially considering DSSSL support of |apply|.