Register pumpkin item (vs block)

Requires deathcap/voxel-registry@d7eaa4b0ca189fcb6dbda5300e380d670a4b913c Support 3D cube (arrays) for item textures, not only block textures
Place block when pumpkin item is used

Requires deathcap/voxel-use@449c571a2052a73cd7a07e8ed44e13541724a2e4
Fix pumpkinNatural block detection (vs item now called just 'pumpkin')
Fix swapped west/east display names
Place item facing opposite direction of player
Drop unidirectional item when mined, orient block in player-facing direction when placed. Closes GH-3
Add items to plants creative tab, hide internal blocks

The itemblocks can still be acquired with e.g., .i pumpkinCarvedNorth,
if needed for some reason. But now the nondirectional items are dropped
when mined and place directional blocks when placed (GH-3), so the
directional block items do not normally need to be exposed to the player.

Requires deathcap/voxel-inventory-creative@05455f4b87e4d173ae184628a03b90c57418afa6 https://github.com/deathcap/voxel-inventory-creative/issues/2