This function deletes the mapping for the specified key from a util/map/hashmap if present. It returns a new map without the key/value.
Since: 3.0
Parameters
map: The original map.key: The specified key.eq: A equality function. If it's ignored, use==to compare elements.hash: A hash function. If it's ignored, convert each element to a string and hash it.
Examples
use <util/map/hashmap.scad>
use <util/map/hashmap_get.scad>
use <util/map/hashmap_del.scad>
m1 = hashmap([["k1", 10], ["k2", 20], ["k3", 30]]);
m2 = hashmap_del(m1, "k1");
assert(hashmap_get(m2, "k1") == undef);

