Creative Skyblock

- removed "Chunk Loaders" mod
- switched from using CraftTweaker to KubeJS
- added "Leahed", and "Uppers" mods
- buffed early game Iron Piece drop rates
- fixed gravel -> andesite smelting recipe not working
- ironchest chests can now be crafted with upgrades
- tweaked Heart of the Sea, coal, coral seed, pickle seed, kelp seed, copper piece, seagrass, nautilus shell, andesite/granite/diorite/basalt/blackstone pebble, ender pearl drop rates from sifting
- added Dead Bush drop to Sand from sifting
- Pam's Harvestcraft gardens now drop from various blocks from sifting
- unified porcelain from "Ceramics" and "Ex Nihilo Sequentia" mods
- added custom game icon and custom window title