added all YCP builtin definitions
moved definitions of implemented builtins
resolved overloaded add() builtin
resolved change() overloaded builtin
resolved filter() overloaded builtin
resolved find() overloaded builtin
resolved foreach() overloaded builtin
resolved isempty() overloaded builtin
removed lsubstring() duplicate
resolved maplist() overloaded builtin
resolved remove() overloaded builtin
resolved select() overloaded builtin
resolved setenv() overloaded builtin
resolved size() overloaded builtin
removed substring() duplicate
resolved srandom() overloaded builtin
resolved sublist() overloaded builtin
resolved tohexstring() overloaded builtin
added tostring() builtin
resolved toterm() overloaded builtin