add callback (init/quit) for hooks
rename tl.all to hook
new event STORY_LOAD
clear all SPRITEs when STORY_LOAD
new function SPRITE.clrObj
new Dannmaku type Laser
set space for Laser objects
[fix] check if parent is alive
add code to check math errors
set initial vx=vy=0 for Dannmakus

so that x/y will not be override
minor changes for Dannmaku OrbAround
default parameters adjustment
add parameters for Dannmaku Laser
update function genDannmaku
update function newEnemy & Dannmaku ZigZag
more parameters for Dannmaku ZigZag