Update v275206


  1. Ore no longer gets absorbed by the world when entombed. Instead we store ore in a much more efficient system which should imrpove the load times of worlds that have a significant amount of entombed ore.
  2. The warning to upgrade your audio driver should properly popup if the game starts without sound.
  3. Fixed a memory/performance leak that was also causing looping sounds to play quieter over time.
  4. Fix for portraits not showing up in the roles screen.
  5. Fixed a bug where liquid could leak through tiles on load.
  6. Fixed a bug where gas could leak through gas impermeable tiles when displaced.