Update 1.0.5

Difficulty rebalancing of Slap Pit and Cryonic Zone
Checkpoint and reels added to Scenario 3 (Slap Pit)
Minor performance improvements
Improved scoreboard loading
Improved Scenario 4 (Cryonic) inaccessible shelf spawners
Fixed checkpoint save/load environmental effects (indoors/outdoors)
Fixed skill check UI sometimes getting stuck on screen