Port multiloader build to Fabric and Forge 1.20.1

common/src/main/resources/skinsg.mixins.json

@@ -0,0 +1,14 @@
+{
+  "required": true,
+  "minVersion": "0.8",
+  "compatibilityLevel": "JAVA_17",
+  "package": "xyz.nightsync.skinsg.mixin",
+  "refmap": "skinsg.refmap.json",
+  "client": [
+    "SkinMagicMixin",
+    "CapeMagicMixin"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}