gstring_replace

Replaces the string find with the string replace in a StringBuilder up to limit times.

If the number of instances of find in the StringBuilder is less than limit, all instances are replaced. If limit is `0`, all instances of find are replaced.

Parameters:

string	a StringBuilder
find	the string to find in string
replace	the string to insert in place of find
limit	the maximum instances of find to replace with replace, or `0` for no limit

Returns:

the number of find and replace operations performed.