-improved loot tables:
-archeology
-trail ruins rare
-trail ruins common
-chests
-shipwreck trasure
-shipwreck supply
-shipwreck map
-ruined portal
-igloo
-pillager outpost
-abandoned mineshaft
-end city
-redstone chamber secret
-added loot table redstone chamber
-redstone chamber and redstone chamber 2 generate up to y21