feat: gradle support (#10)

Switching to the ScaffoldIt Gradle Plugin adding:
- HytaleServer.jar via the official Hytale maven
- Monorepo support via `common {}` block
- Kotlin support via `useKotlin()` function
- Hot-reloading using DCEVM JVM and IDEA
- Automatic manifest in-place generation
- Automatic source path scaffolding
- Source-linked Devserver for zero jar
- Source-linked Asset Editor

build.gradle.kts

@@ -0,0 +1,14 @@
+//
+// Not needed, but you can switch using it here too!
+//
+//plugins {
+//    id("dev.scaffoldit") version "0.2.1"
+//}
+//
+//hytale {
+//    manifest {
+//        Group = "HytaleModding"
+//        Name = "ExamplePlugin"
+//        Main = "dev.hytalemodding.ExamplePlugin"
+//    }
+//}