Update durations() param to take an array of units

[parulsingh23]

This update also includes a bug to the duration function providing too many terms (i.e. for duration(10000000,1) it provides "2 hours, 46 minutes, 40 seconds"), but that was fixed with adding some additional checks in the for loop's if-else statements.
With this update, you can (instead of providing a terms param with the limiting number of units) provide the param with the array of unit types desired. That unit array can be unordered, and if none of the terms 'fit' in the milliseconds provided, then the smallest-magnitude unit along with 0 is returned (in no other cases will a zero term be displayed).
EX: duration(1, [seconds, days, hours]) returns [“0 seconds”] & duration(60 * 60 * 1000+2000, [hours, ms]) returns ["1 hour", "2000 ms"]