use legacy looming, include fastutil in jar

build.gradle

@@ -13,6 +13,7 @@ plugins {
     id "com.matthewprenger.cursegradle" version "1.4.0" // This repository is archived on GH
     id "com.modrinth.minotaur" version "2.8.7"
     id "fabric-loom" version "1.6-SNAPSHOT" apply false
+    id "legacy-looming" version "1.6-SNAPSHOT" apply false // Version = fabric-loom
     id "com.github.ben-manes.versions" version "0.51.0"
     id "xyz.wagyourtail.jvmdowngrader" version "0.7.1"
 }
@@ -40,6 +41,7 @@ def getBranch() {
 allprojects {
     apply plugin: "maven-publish"
     apply plugin: "fabric-loom"
+    apply plugin: "legacy-looming"
 
     java {
         toolchain {
@@ -143,6 +145,7 @@ dependencies {
 
     includeJ8("com.viaversion:viaversion:${rootProject.viaver_version}")
     include("org.yaml:snakeyaml:${rootProject.yaml_version}")
+    implementation("it.unimi.dsi:fastutil:8.5.13")
 }
 
 remapJar {

settings.gradle.kts

@@ -3,6 +3,7 @@ pluginManagement {
         gradlePluginPortal()
         mavenCentral()
         maven ("https://maven.fabricmc.net/")
+        maven ("https://repo.legacyfabric.net/repository/legacyfabric/")
     }
 }
 

viafabric-mc1122/build.gradle.kts

@@ -8,7 +8,3 @@ dependencies {
     @Suppress("GradlePackageUpdate", "RedundantSuppression")
     implementation("io.netty:netty-all:4.0.56.Final")
 }
-
-loom {
-    intermediaryUrl.set("https://maven.legacyfabric.net/net/legacyfabric/intermediary/%1\$s/intermediary-%1\$s-v2.jar")
-}

viafabric-mc189/build.gradle.kts

@@ -11,7 +11,3 @@ dependencies {
     @Suppress("GradlePackageUpdate", "RedundantSuppression")
     implementation("io.netty:netty-all:4.0.56.Final")
 }
-
-loom {
-    intermediaryUrl.set("https://maven.legacyfabric.net/net/legacyfabric/intermediary/%1\$s/intermediary-%1\$s-v2.jar")
-}