Packages

* Now available for 1.21.1 Fabric as well as 1.20.1.
* Now available for 1.21.1 Neoforge as well as Forge 1.20.1.
* New item: *Sticky Syrup*. Apply it to a package to make it *sticky*. Sticky packages remember their item even when they are empty.
  * This replaces the old system of packages becoming sticky when they are next to a slime/honey block. Not many people knew about it!
  * The old system is available behind a config option.
* Tweak interactions with regard to sticky packages. (For example, you can insert items into an empty, sticky package, even if they aren't items from your hand.)
* Remove the annoying honey particles from sticky packages. Sticky packages can now be distinguied by "sticky" text that appears when shifting.
  * It is behind a client config option, if you want them back for some reason...
* Stickiness might actually work on Forge!!!!! (lmao) it wasn't being enforced through the `IItemHandler`.
* Slightly less willing to be placed vertically. You have to look up/down a bit farther.
* Fix an issue where items which stacked to 16 could be deleted using Packages inventory interactions.
* On Fabric, a nonnull `RenderMaterial` is passed when working with fabric-api, possibly fixing some clientside mod-compat issues.
* On 1.20.1, migrate off of a deprecated `fabric-api` method for registering custom models.
* On 1.21.1, `PackageBlockEntity` no longer implements vanilla `Container`! Instead, modloader-specific inventory mechanisms are used.
  * On NeoForge, the Package exposes an `ItemHandler` capability. On Fabric, the Package exposes an `ItemStorage` API. 
  * This was a rather large change so I'd like to test it before backporting it to 1.20.1.
* On 1.21.1, the Package *item* also exposes these modloader-specific inventories.
  * This means other mods which can, e.g., pull blocks out of shulker boxes in your inventory, may be able to pull items out of Packages too.
  * This feature needs more testing.

On NeoForge, enable the "NeoForge Light Pipeline" in `Mods` -> `NeoForge` -> `Client settings` -> `NeoForge Light Pipeline`. This will improve the apperance of the Package Crafter.

On Fabric 1.20.1, if you have Sodium remember to install Indium. No longer necessary as of Sodium for 1.21.1.