Additions:

• added zende, which is a life energy-type thing. Thou gainest it by killing mobs, when it reaches zero, thou diest.
• mobs can have random names, which are displayed upon hovering
• added death reasons (only for getting killed by entities for now)
• added some basic item descriptions, that appear when holding H

Changes:

• passable blocks can be placed where entities stand
• mobs are faster
• mobs can dive underwater to reach whatever they are angry at