Rooms and Layers System

Fully implemented the Rooms and Layers system. It is as of yet not fully
tested.
Layers Patch 2

Updated the layer livedraw system to insert the drawn image in its
proper place rather than simply drawing it on top.
Prime Numbers

Added a Prime class which currently contains an implementation of the
Sieve of Eratosthenes but will eventually contain a redundancy of
primality tests.