Pack format

pack_format is a version number used to group versions with compatable assets. This number is used in:


 * version.json
 * Resource Packs
 * Version number is for 1.6.1–1.8.9,  for 1.9–1.10.2,  for 1.11–1.12.2,  for 1.13–1.14.4,  for 1.15–1.16.1,  for 1.16.2–1.16.4, and  for 1.17.
 * Data Packs
 * Version number is for 1.13–1.14.4,  for 1.15–1.16.1,  for 1.16.2–1.16.4, and  for 1.17.