Port to 1.21

- Rewrite packet system to use vanilla payloads
- Water bottles will now appear slightly transparent
- One of the hardest 1.21 ports yet

build.gradle

@@ -1,7 +1,8 @@
 plugins {
     id "architectury-plugin" version "3.4-SNAPSHOT"
-    id "dev.architectury.loom" version "1.5-SNAPSHOT" apply false
+    id "dev.architectury.loom" version "1.6-SNAPSHOT" apply false
     id "me.shedaniel.unified-publishing" version "0.1.+" apply false
+    id 'com.github.johnrengelman.shadow' version '8.1.1' apply false
 }
 
 architectury {
@@ -22,10 +23,14 @@ subprojects {
         // The following line declares the mojmap mappings, you may use other mappings as well
         //mappings loom.officialMojangMappings()
         // The following line declares the yarn mappings you may select this one as well.
-        mappings "net.fabricmc:yarn:${rootProject.yarn_mappings}:v2"
+        mappings loom.layered {
+            it.mappings("net.fabricmc:yarn:$rootProject.yarn_mappings:v2")
+            it.mappings("dev.architectury:yarn-mappings-patch-neoforge:$rootProject.yarn_mappings_patch_neoforge_version")
+        }
     }
 }
 
+
 allprojects {
     apply plugin: "java"
     apply plugin: "architectury-plugin"
@@ -45,7 +50,7 @@ allprojects {
 
     tasks.withType(JavaCompile) {
         options.encoding = "UTF-8"
-        options.release = 17
+        options.release = 21
     }
     ext {
         releaseChangelog = {