Add steamwar.kotlin.gradle

KotlinCore/build.gradle.kts

@@ -18,14 +18,10 @@
  */
 
 plugins {
-    steamwar.java
-    kotlin("jvm") version "2.0.0"
+    steamwar.kotlin
     alias(libs.plugins.shadow)
 }
 
-group = "de.steamwar"
-version = ""
-
 tasks.build {
     finalizedBy(tasks.shadowJar)
 }
@@ -34,17 +30,6 @@ tasks.shadowJar {
     exclude("org/**")
 }
 
-java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
-}
-
 dependencies {
-    implementation(kotlin("reflect"))
-
     compileOnly(libs.paperapi21)
 }
-
-kotlin {
-    jvmToolchain(21)
-}