Game is now resizable by casting the GameContainer as an
AppGameContainer and calling .setDisplayMode(width, height, false);
The game runs at twice the native resolution for RPGMaker and scales it
down by a factor of 0.5 to avoid pixel blur when it is scaled back up.
The next step is character creation, which I will continue work on over
the next week. Also, the parallax scrolls with the clouds over the
title. Cool, huh?

Signed-off-by: Anthony Winder <anthony.winder@gmail.com>