-Update to 1.21
-Don't use empty prefixes
-Fix MC version detection
-Add ItemType placeholder type
-Fix placeholder type for vanilla
-Fix NPE on DoubleEvaluator
-Use spigot API for attributes in 1.18+
-Backward compatibility around InventoryViews
-Add option to use only air for LocUT#getFirstGroundBlock
-Add DamageRegistry
-Add MEDIUMTEXT column type