Updating to match upstream

gradle.properties

@@ -1,8 +1,8 @@
 group=com.lokamc.slice
-version=1.20.4-R0.1-SNAPSHOT
-
-mcVersion=1.20.4
+version=1.21.3-R0.1-SNAPSHOT
+mcVersion=1.21.3
 paperRef=5436d44bf2509ff89129f8790ee4643f09c72871
+updatingMinecraft=true
 
 org.gradle.caching=true
 org.gradle.parallel=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

settings.gradle.kts

@@ -1,10 +1,59 @@
-pluginManagement {
+import java.util.Locale
+
+        pluginManagement {
             repositories {
                 gradlePluginPortal()
                 maven("https://repo.papermc.io/repository/maven-public/")
             }
+        }
+
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+
+if (!file(".git").exists()) {
+    val errorText = """
+        
+        =====================[ ERROR ]=====================
+         The Paper project directory is not a properly cloned Git repository.
+         
+         In order to build Paper from source you must clone
+         the Paper repository using Git, not download a code
+         zip from GitHub.
+         
+         Built Paper jars are available for download at
+         https://papermc.io/downloads/paper
+         
+         See https://github.com/PaperMC/Paper/blob/master/CONTRIBUTING.md
+         for further information on building and modifying Paper.
+        ===================================================
+    """.trimIndent()
+    error(errorText)
 }
 
 rootProject.name = "slice"
 
-include("slice-api", "slice-server")
+for (name in listOf("slice-api", "slice-server")) {
+    val projName = name.lowercase(Locale.ENGLISH)
+    include(projName)
+    findProject(":$projName")!!.projectDir = file(name)
+}
+
+optionalInclude("test-plugin")
+optionalInclude("paper-api-generator")
+
+fun optionalInclude(name: String, op: (ProjectDescriptor.() -> Unit)? = null) {
+    val settingsFile = file("$name.settings.gradle.kts")
+    if (settingsFile.exists()) {
+        apply(from = settingsFile)
+        findProject(":$name")?.let { op?.invoke(it) }
+    } else {
+        settingsFile.writeText(
+            """
+            // Uncomment to enable the '$name' project
+            // include(":$name")
+
+            """.trimIndent()
+        )
+    }
+}