Peek flat shulker icons

    Release v1.0
    
    This took a while, apologies. The few times I looked at updating the
    pack it just looked like a lot of arbitary work, and I’ve been trying to
    spend my free time actually building in Minecraft rather than building
    to build in Minecraft.
    
    Everything in the pack is updated to 1.21.9, as the requirements around
    {supported_,pack_}formats means I cannot straddle both older and newer
    versions. Nor could I, numerous breaking changes around model selection
    prevent the older set-up working. Something may be broken, but I am
    still pretty new to resourcepacks, so any advice is welcome :^)
    
    A few new blocks are added with this update, but full coverage isn’t
    here yet. Pale oak and variants. Pale moss blocks and carpet. Resin
    brick blocks, walls, slabs and stairs have been added. On top of that,
    honey levels for bee hives and bee nests are now shown.
    
    Some features haven’t been able to stay with us, as the game is awkward
    around minecraft:special items. Our flattened player_heads / skulls are
    no longer here. I’ll try to find a way to bring them back.