Big Changes! The Wandering Trader Update!

• Normally the Wondering Trader uses the heightmap to spawn (so it cannot spawn), but now a custom system has been implemented!
• For versions 1.20.2+, the Wandering Trader spawns randomly around you at your height level. Dig out a flat area for a higher chance to get a spawn!
• For 1.20-1.20.1, for technical limitations, it only spawns at 0,64,0 every 2 days. I would recommend playing modern versions.
• Updated some advancements to better reflect the addition of the Wandering Trader.
• Removed chest content that is not necessary now that the Wandering Trader can spawn.