Patch 1.0 -> 1.9 — I wanna be The Cat Steam update #374380

* New achievement: Really Impossible - Win the game on medium without dying * New achievement: Medium Speedrun - Win the game on medium under 13 minutes * New achievement: Unstoppable - Win the game on hard taking no more than 3 hits - Credits displayed the same names twice in a row - Changed sound effects for Mewrio fight - Mewrio's big ball had a weird hitbox allowing cheese strats and was also damaging the player incorectly - Multiplayer spawned players outside of the field - Super hero achievement did not trigger - Best cat in the world achievement did not trigger - World achievements did not trigger properly - Items leveling was not working - Ballanced a lot of levels - Fixed max hp not getting properly displayed after hitting a warp - Final boss phase 1 nerf - Final boss phase 2 nerfed, shortened on medium and hard, removed cheese strats - Final boss phase 3 had a cheese strat allo...