Refactor item containers add droppable item and drag and drop between actor

[maqloner]

• Add a carried property to MBItem, all items are by default carried.
• Only carried items are considered in the total weight calculation
• Add drag and drop of items between container, follower and character actor type
• Item container can now have items inside, and can be dropped (carried=false)
• Add a configuration for item types that can be dropped (carried=false), these items have a button in the actor inventory
• Add a configuration for the allowed item types inside an item container
• Add a configuration for equippable item types, these items have a button in the actor inventory
• Moved all ActorSheet derived data calculation to MBActor and MBItem
• Create a common template for equipement list
• Add missing translation key to the de, fr, and sv lang files
• Fix a bug in the follower violence tab when they had a shield
• Item containers with a weight of zero are always assumed not to be carried