stonecutter: setup project for multiversion support

- Switch to Stonecutter build system
- Migrate mappings to Mojmap

settings.gradle.kts

@@ -0,0 +1,33 @@
+pluginManagement {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+        maven("https://maven.fabricmc.net/")
+        maven("https://maven.architectury.dev")
+        maven("https://maven.minecraftforge.net")
+        maven("https://maven.neoforged.net/releases/")
+        maven("https://maven.kikugie.dev/snapshots")
+    }
+}
+
+plugins {
+    id("dev.kikugie.stonecutter") version "0.7"
+}
+
+stonecutter {
+    centralScript = "build.gradle.kts"
+    kotlinController = true
+    shared {
+        fun mc(loader: String, vararg versions: String) {
+            for (version in versions) vers("$version-$loader", version)
+        }
+        //i would recommend to use neoforge for mc > 1.20.1, i haven't tested template for forge on versions higher than that
+        mc("fabric","1.20.1", "1.21.1", "1.21.5", "1.21.8", "1.21.10")
+        mc("forge","1.20.1")
+        //WARNING: neoforge uses mods.toml instead of neoforge.mods.toml for versions 1.20.4 (?) and earlier
+        mc("neoforge", "1.21.1", "1.21.5", "1.21.8", "1.21.10")
+    }
+    create(rootProject)
+}
+
+rootProject.name = "Puzzle"