Migrate to new Hytale plugin template structure

Replaces the previous Kotlin-based Gradle build and template files with a new Java-based Gradle build system and updated example plugin code. Removes old build scripts, plugin template, and configuration, and introduces a new ExamplePlugin with updated manifest, command, and recipe example. Updates documentation and project configuration to match the new structure and usage.

gradle.properties

@@ -1,10 +1,32 @@
-# Project Information
-pluginGroup=com.example
-pluginVersion=1.0.0
-pluginDescription=A Hytale plugin template with best practices
+# The current version of your project. Please use semantic versioning!
+version=0.0.2
 
-# Gradle Configuration
-org.gradle.parallel=true
-org.gradle.caching=true
-org.gradle.daemon=true
-org.gradle.jvmargs=-Xmx2048m -XX:MaxMetaspaceSize=512m
+# The group ID used for maven publishing. Usually the same as your package name
+# but not the same as your plugin group!
+maven_group=org.example
+
+# The version of Java used by your plugin. The game is built on Java 21 but
+# actually runs on Java 25.
+java_version=25
+
+# Determines if your plugin should also be loaded as an asset pack. If your
+# pack contains assets, or you intend to use the in-game asset editor, you
+# want this to be true.
+includes_pack=true
+
+# The release channel your plugin should be built and ran against. This is
+# usually release or pre-release. You can verify your settings in the
+# official launcher.
+patchline=release
+
+# Determines if the development server should also load mods from the user's
+# standard mods folder. This lets you test mods by installing them where a
+# normal player would, instead of adding them as dependencies or adding them
+# to the development server manually.
+load_user_mods=false
+
+# If Hytale was installed to a custom location, you must set the home path
+# manually. You may also want to use a custom path if you are building in
+# a non-standard environment like a build server. The home path should
+# the folder that contains the install and UserData folder.
+# hytale_home=./test-file