stonecutter: setup project for multiversion support

- Switch to Stonecutter build system
- Migrate mappings to Mojmap

stonecutter.gradle.kts

@@ -0,0 +1,16 @@
+plugins {
+    id("dev.kikugie.stonecutter")
+    id("dev.architectury.loom") version "1.13-SNAPSHOT" apply false
+    id("architectury-plugin") version "3.4-SNAPSHOT" apply false
+    id("com.github.johnrengelman.shadow") version "8.1.1" apply false
+    id("me.modmuss50.mod-publish-plugin") version "0.8.4" apply false
+}
+stonecutter active "1.21.10-fabric" /* [SC] DO NOT EDIT */
+
+// See https://stonecutter.kikugie.dev/wiki/config/params
+stonecutter parameters {
+    swaps["mod_version"] = "\"" + property("mod.version") + "\";"
+    swaps["minecraft"] = "\"" + node.metadata.version + "\";"
+    constants["release"] = property("mod.id") != "template"
+    dependencies["fapi"] = node.project.property("deps.fabric_version") as String
+}