Minecraft wiki entry for Flattening, associated text: Models
Renamed to use the new IDs.
Block state files
Renamed to use the new IDs.
"normal" for blocks without block states changed to an empty string ("").
Item frames now have "map=false" instead of "normal" and "map=true" instead of "map".
Model references no longer start at the models/block/ folder, but instead at models/.
Textures
Renamed to use the new IDs.
Renamed the blocks folder to block.
Renamed the items folder to item.
Recipes
Renamed to use the new IDs.
Advancements
Recipe advancements renamed to use the new IDs.
Language files