Misty Dale Fixes

1.12.0

• Block transitions: the 13 extra transition rules of the Misty Dale resource pack (sand, red sand, gravel, mycelium, clay, sandstone, red sandstone, packed and blue ice, soul soil, crimson and warped nylium, blackstone) now get their tiles drawn while the game loads resources: the edge shapes of the active pack's transitions (Excalibur) filled with the block's current texture. The resource pack therefore ships no copy of another pack's art. The tiles are pixel-identical to the ones shipped before.
• No other changes: all mixins are the same as in 1.11.0.