Metagal major SFX update and balance change. — METAGAL Steam update #221591

- Improve sound effect with some new SFX like character attack , enemy die. - Add Hit contact effect such as confirm damage effect show when enemy recieve damage and shield when attack do no effect. - Improve collision on some area of the map. - Improve level layout decrease cheap kill area also remove spike or insta death trap around CP. - Add 2 extra check point on fortress 3 stage. - rework on boss HP now have 24 HP same to player but also have longer invincible frame - rebalance Weapons due boss damage changed. - Balance Enemies.