Implement weapon 5 level 2

- Changed weapon 5 lvl 1 to:
freeze enemy, cause damage to it and then release it after 30 frames
- Weapon 5 lvl 2 :
freeze enemy, cause damage to it and then release it after 30 frames.
in the same time, shoot 6 other freezing bullets that can damage and
freeze enemy for 10 frames.

- Uploaded new image for freezing bomb