Update to MC 1.20.6

- Update EMI and REI integration, and fix some issues with the upgrade
   crafting hooks.
 - Just use smooth stone for recipes, not #c:stone. We're mirroring
   redstone's crafting recipes here.
 - Some cleanup to printouts.
 - Remote upgrade data generators - these can be replaced with the
   standard registry data generators.
 - Remove the API's PlatformHelper - we no longer have any
   platform-specific code in the API.

projects/forge-api/build.gradle.kts

@@ -15,6 +15,11 @@ cct.inlineProject(":common-api")
 
 dependencies {
     api(project(":core-api"))
+
+    // FIXME: This should be implementation (and in the common Forge config)
+    // but NeoGradle does weird things and we end up with two Forge deps on the
+    // classpath - https://github.com/neoforged/NeoGradle/issues/162.
+    compileOnly("net.neoforged:neoforge:${libs.versions.neoForge.get()}")
 }
 
 tasks.javadoc {