Add generic array reverse function

[delphidabbler]

Add new Reverse<T> function to TArrayUtils that returns a copy of a given array with elements reversed in order.

E.g. TArrayUtils.Reverse<Integer>(TBytes.Create(1,2,3)) will return array with contents [3,2,1].

[delphidabbler]

Also add a TBytes specific stand-alone function that reverses a byte array: ReverseByteArray.

[delphidabbler]

Both TArrayUtils.Reverse<T> and ReverseByteArray were added, along with unit tests for both by merge commit a19dc9e.

Also added test for ByteArraysEqual that was required to test ReverseByteArray.