Mojang did NOT add dataconverters for world gen configurations
that they CHANGED. So, the codec fails to parse old data.
This fixes two instances:
- IntProvider is new and Mojang did not account for old data.
Thankfully, only ColumnPlace needed to be special cased.
- TreeConfiguration had changes. Thankfully, they were
only renames for one value and thankfully defaults could
be provided for two new values (WITHOUT changing behavior).
