Re-write root and libs to Kotlin DSL

build.gradle.kts

@@ -0,0 +1,28 @@
+import org.ajoberstar.grgit.Grgit
+
+println("""
+*******************************************
+ You are building WorldEdit!
+
+ If you encounter trouble:
+ 1) Read COMPILING.md if you haven't yet
+ 2) Try running 'build' in a separate Gradle run
+ 3) Use gradlew and not gradle
+ 4) If you still need help, ask on Discord! https://discord.gg/enginehub
+
+ Output files will be in [subproject]/build/libs
+*******************************************
+""")
+
+applyRootArtifactoryConfig()
+
+if (!project.hasProperty("gitCommitHash")) {
+    apply(plugin = "org.ajoberstar.grgit")
+    ext["gitCommitHash"] = try {
+        (ext["grgit"] as Grgit).head().abbreviatedId
+    } catch (e: Exception) {
+        println("Error getting commit hash: " + e.message)
+
+        "no_git_id"
+    }
+}