V39 - Artifacts 2

- Artifacts on some multiplayer maps now have preconfigured (not random) stats

- Multiplayer options for Artifacts adjusted:

  - "Disabled" still disables all Artifacts indiscriminately

  - "Map Settings" option will keep only those Artifacts with attributes set to fixed values by map

  - "Super Random" option itemizes stats of each Artifact independent of what was set by map

- Lower default audio volume across the board

- Tweaks