Player Graves

Added more configuration options

• Locked Graves: Graves can only be opened by their owner
• Keep Experience: Players keep all of their experience on death
• Keep Hotbar: Players keep all items in their hotbar and offhand on death
• Keep Armor: Players keep all items equiped in armor slots on death
• Keep Some Items: Players keep all items in tags/kept_items on death (By default this is all armor, tools, weapons, and other equipment when enabled)
• Lose Some Items: Players permanently lose items in tags/lost_items on death (By default this is nothing even when enabled)