did some bullet stuff
Fixed Bullet & Shooting code
**********************************************

character.h
============================
- Moved Bullet struct definition to "bullet.h"
- Added Ghost::isHitByBullet() to check for Ghost-Bullet collision

bullet.h
============================
- Bullet struct
	- Modified draw() to use gotoTileDown() correctly
	- Modified move() to remove redundant code
	- Added "collided" boolean to control deletion

game.h
============================
- Modified update() to implement code for controlling Bullet spawn and despawn
- Modified render() to draw and undraw Bullets

maps.h
============================
- Added a pointer to a Bullet "*shot" to control the Bullet in the map
- Modified constructor to give a default NULL value to "*shot"
Merge branch 'Bullet'

Conflicts:
	SP1Framework/characters.h