Minecraft layered item sprites

Selected item sprites from Mineclonia contributors.
https://codeberg.org/mineclonia/mineclonia
Pinned revision: 5258bf22599f0d9ca4cf7dad258acc0a91bdb23a
Pinned release: 0.123.0 / ContentDB 37652
Archive SHA-256: 3f2255d5dffcff44d726e38f64a8362932281fb270976c753be375bdcc1aa1fa

Mineclonia records textures as Pixel Perfection / Pixel Perfection
Legacy derivatives under CC BY-SA 4.0 unless a module says otherwise;
remaining media defaults to CC BY-SA 3.0. See MINECLONIA-LEGAL.md and
MINECLONIA-MODULE-NOTICES.txt. The mcl_core directory is excluded.

Reviewed supplemental 16px sprites from REFI_Textures by MysticTempest.
https://github.com/MysticTempest/REFI_Textures
Pinned revision: 33f1f719930d1d202beaa5fa6251c26d3a711149
License: CC BY-SA 4.0. See REFI-README.md and
REFI-LICENSE-CC-BY-SA-4.0.txt. REFI states that its textures were
created from scratch; its default_mcl_core path names describe game
compatibility and do not refer to the excluded Mineclonia source tree.

Reviewed wooden Spear and Spectre/Phantom Membrane sprites from
VoxeLibre by the-real-herowl. The membrane is the flying-mob drop
used to brew Slow Falling in the pinned source.
https://github.com/VoxeLibre/VoxeLibre
Pinned revision: f2463975f0ae98e1847ff76e1251f3e945a656e2
Wooden Spear source commit: ce95290fa846ce188cfda59e735cdab14def1570
Phantom Membrane source commit: 018814c362c5ae560d9ad1c2abbeaa18c9ff2ad6
License: CC BY-SA 3.0. See VOXELIBRE-LEGAL.md.

Reviewed Knowledge Book, Turtle Scute, and Turtle Shell sprites from
Pixel Perfection Community Edition by XSSheep and its contributors.
https://github.com/Athemis/PixelPerfectionCE
Pinned revision: 28e38cab7c1f03f86364ef704f705bebcc13cb3d
License: CC BY-SA 4.0. Its contribution rules explicitly prohibit
copied Minecraft assets. See PIXEL-PERFECTION-CE-README.md and
PIXEL-PERFECTION-CE-LICENSE-CC-BY-SA-4.0.md.

Reviewed Goat Horn sprite from Replete by GrandmaPork.
https://github.com/steves-underwater-paradise/replete
Pinned revision: b3a6af388225fcd763328447a9452bfaa4628d41
Source commit: b3a6af388225fcd763328447a9452bfaa4628d41
License: CC BY-SA 4.0. See REPLETE-README.md and
REPLETE-LICENSE-CC-BY-SA-4.0.txt.

The browser presentation adds shallow layered geometry but does not
alter the checked-in sprite pixels.