bug fixed

fixed the bug of the camera bound
delete some trash
new folder

add a new folder named EnemySpawner
some modification

creat a new folder(EnemySpawner)
add testTube into this folder
modification

change into png type
EnemySpawner

1:create a EnemySpawner
2:implement basic damage to enemy
3:implement basic damage to EnemySpawner
4:add several particle system to EnemySpawner
subtle change in parameter during test

NO great impact
Revert "subtle change in parameter during test"

This reverts commit fcd94aef68b40d723e2bafd1e98793a0e5d54844.
solve conflicts
clear trash
scene1