Various changes to implement medivo boss behavior. Medivo boss behavior isn't finished yet but works up until the spikes.

anim.cpp, anim.h
*) Changes in animations to properly support accessory positions.
*) Changes in animations to properly support accessory shooting positions.

bullet.cpp, bullet.h
*) New constructor for a custom bullet starting position

levelframe.cpp
*) Support medivo boss

event.cpp, eventframe.cpp
*) Small changes in getAnim()
*) Small changes in step method

guardians.cpp, guardians.h
*) Made the eight shape in the first stage.
*) Made the jumping behavior, but this doesn't work as it should yet.
*) Did not implement the overlap method yet.