On a list, replaces an item in that list. index is the index of the item to be replaced, starting with 0. (The 6th item in a list would have an index of 5.) Note that "replace-item" is used in conjunction with "set" to change a list.
Likewise for a string, but the given character of string1 removed and the contents of string2 spliced in instead.
show replace-item 2 [2 7 4 5] 15 => [2 7 15 5] show replace-item 1 "cat" "are" => "caret"
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