implemented array, added some new builtin functions

Ferenc Szontágh

2025-04-19 ea9af87ba4399d094180f06be59c878d864a17e0

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string $s = "hello_world";
printnl(string_substr($s, 6, 5));
printnl(string_substr($s, 0, 5));
printnl(string_substr($s, 0, 50));