Integrate health into playerattributes

[snipercup]

Right now the player has hardcoded health. Health is subtracted when an enemy attacks the player. Health is added when the player eats some food.

We should change this to:

• Have 6 new playerattributes for health, one for each body part
• Adjust the Mobeditor to accept playerattributes as targets for it's attack
• Remove "health" from food type objects
• Implement the "medical" category for items and have those target the health playerattributes