Improve correctness of 1.8 item varieties data (#772)

* first draft

* 1.8 fixed

* added various stained stuff to 1.8

* added spawn egg varieties

* added spawn egg metadata 0

* undo all the changes in versions other than 1.8

* fixed red sandstone names & added saplings

* fix json formatting

* add cooked fish varieties

* rerun

* ci