Wire DataPackManager, add uninstall, update build

Swap Shadow plugin to com.gradleup.shadow v8.3.5 and add kotlin serialization plugin. Add relocations for bundled libraries (fastboard, Hikari) in the shadowJar.

Make DataPackManager a plugin-scoped property: initialize and install it during onLoad and call uninstall during onDisable. Add a convenience uninstall() that reads the target world from config and removes the datapack there. Also comment out writeNoiseSettingOverride with a warning that the simplified file crashes Minecraft 1.21.

build.gradle.kts

@@ -1,9 +1,10 @@
 plugins {
 	id("java")
 	id("maven-publish")
-	id("com.github.johnrengelman.shadow") version "8.1.1"
+	id("com.gradleup.shadow") version "8.3.5"
 	kotlin("jvm") version "2.2.0"
 	kotlin("kapt") version "2.2.0"
+	kotlin("plugin.serialization") version "2.2.0"
 }
 
 group = "club.mcscrims"
@@ -47,6 +48,9 @@ tasks {
 		archiveBaseName.set("GameModes-SpeedHG")
 		archiveClassifier.set("")
 		archiveVersion.set(project.version.toString())
+
+		relocate("fr.mrmicky.fastboard", "club.mcscrims.speedhg.libs.fastboard")
+		relocate("com.zaxxer.hikari", "club.mcscrims.speedhg.libs.hikari")
 	}
 
 	build {