Dragoon Hotfix

Originally planned to nerf dragoon with the next actual update, but then it just became too much...

• Dragoon nerfed: "This follower can have up to 4 additional traits" (tip: artificer)
• Relic of Multitude changed: "Each follower can have up to 3 additional traits"
• Fixed Barrier still triggering Artificer.
• Changed the corruption level of some relic modifiers to more closely match their difficulty.
• Fixed some code that COULD be causing reliquary mode to lag; please let us know if it still lags or not!
• Updated engine to Unity 6 in preparation of Unity Plus being gone; please let us know if there's anything weird!