Kobolds

• Kobolds can now pick up items.
• Kobolds will no longer despawn in Peaceful Mode.
• Kobolds will no longer count as monsters when attempting to sleep in a bed.

Note: This update wasn't originally planned as I am working on the 1.17.1 but due to how big these three small changes are, I wanted to do a final update for 1.16.5 to get these in. Please be warned though that giving non-warrior kobolds a shield can have unexpected results as I didn't went through fully and redo all of the model/animation code when giving them the ability to pick up items.