Prime Testing App

A playground app with which to try out some C++ development.

TODO

1. Add recursion to list prime factors only.
2. Add functionality to enter 2 numbers and find primes between -- DONE, sort of.
3. Add a function to count the number of prime factors
4. Consider some GUI options.
5. Sort input numbers by 'primality', i.e. number of prime factors from 0 (most prime) to max (least prime).
6. Add twin-primes finder.

Also: Need to merge with C++ multi-file project template to expand functionality. -- DONE.