Update 42c: Swarm moved to "Experimental" classes + bugfixes

Changes:

• moved Swarm to the "Experimental" class pack
• reduced Happy and Grumpy gun damage from 20 to 16

Fixed:

• can no longer spawn as Swarm mid-round
• fixed Swarm drones sometimes becoming bugged out after being destroyed, resulting in them breaking the cycling of alive Swarm drones and not being repairable
• fixed NPCs sometimes trying to pathfind through closed doors

Level Editor:

• fixed "Custom Stealable Object" missing mesh bug introduced in the last update
• added additional client-side logging for loading "Custom Stealable Objects"
• fixed "Garbage Bin" object not working correctly