Move math functions abs, ceil, floor, round, min, max from stdlib to puppet

The math functions abs, ceil, floor, round, min, and max are now available in puppet. The functions are compatible with the functions with the same name in stdlib with the added feature in min/max if calling them with a single array and being able to use a lambda with a custom compare. These stdlib math functions used inconsistent string to numeric conversions that were also unintentionally making the functions compare values in strange ways. The automatic conversions are now deprecated and will issue a warning.