Stackable Shulkers Fix

Added legacyShulkerItemMerging rule. Read mod description for more info.

Fixed incompatibility with 1.21.2/.3, added mod icon and updated mod metadata.

Fixed incompatibility with Lithium 0.14.

Added carpet rules:

• hopperShulkerStacking
• overstackedShulkerSignalStrength
• hopperCollectSingleShulkers
• minecartCollectSingleShulkers
• overstackedMinecartSlowdown

See mod description for more info.

Fixed typo in compat mixin with Lithium 0.12.

Added clientShulkerSync rule from the Carpet issue #1899 (by ch-yx).
This behavior is disabled by default and only required if you have players without Tweakeroo on your server.

Fixed shulker boxes stacking with Lithium 0.13.

Fixed comparator signal strength calculation with Lithium installed.