Version 2.1.6

• Add a set of cubedropper instances for Portal 2.
• Vactube enhancements:
  • cross-junction splitter for vactubes
  • Support for frankenturrets
  • Allow having different object sets for each vactube
• Add comp_relay, a simplified version of relays which is collapsed into the callers.
• Update to Mapbase 4.1
• Add UniqueState inputs to logic_branch_listener, which creates a logic_branch for each unique input entity.
• Sprites for skybox_swapper, comp_pack_replace_soundscript, env_portal_credits and info_ping_detector by Luke.