[1.21.4] Add event for registering custom special block model renderers

[XFactHD]

This PR adds an event for attaching custom SpecialModelRenderers to blocks which render a part of or their entire model in a BER (i.e. blocks like chests, signs, skulls, shulker boxes, banners and beds). These SpecialModelRenderers are used via BlockRenderDispatcher#renderSingleBlock() when such a block is rendered in a minecart, as a display entity, on the back of a mushroom cow, in the iron golem's hand or in the enderman's hands.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: 85f82c304dc108da29d5cf702a2d484ee478fb7a.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:testframework:21.4.28-beta-pr-1777-special_block_renderer
• 📦 net.neoforged:neoforge:21.4.28-beta-pr-1777-special_block_renderer

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven {
        name 'Maven for PR #1777' // https://github.com/neoforged/NeoForge/pull/1777
        url 'https://prmaven.neoforged.net/NeoForge/pr1777'
        content {
            includeModule('net.neoforged', 'testframework')
            includeModule('net.neoforged', 'neoforge')
        }
    }
}

MDK installation

In order to setup a MDK using the latest PR version, run the following commands in a terminal.
The script works on both *nix and Windows as long as you have the JDK bin folder on the path.
The script will clone the MDK in a folder named NeoForge-pr1777.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1777
cd NeoForge-pr1777
curl -L https://prmaven.neoforged.net/NeoForge/pr1777/net/neoforged/neoforge/21.4.28-beta-pr-1777-special_block_renderer/mdk-pr1777.zip -o mdk.zip
jar xf mdk.zip
rm mdk.zip || del mdk.zip

To test a production environment, you can download the installer from here.

[neoforged-releases]

🚀 This PR has been released as NeoForge version 21.4.35-beta.