Container & door revision

The containers are now much more powerful:

• cannot pick up objects
• Can trigger events
  • if items are missing
  • if items in container with the exact amount
  • if at least certain items with at least defined amout exits
  • if one ore more items on specified position
• events are:
  • destroy item in container
  • create item
    • in player inventory
    • in itself
    • any other container in the game world

Doors are overhauld for later interaction with these containers...