Clean repo for open source release

Remove build artifacts, dev tool configs, unused dependencies,
and third-party source dumps. Add proper README, update .gitignore,
clean up Makefile.

src/main/resources/tiedup.mixins.json

@@ -0,0 +1,27 @@
+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "com.tiedup.remake.mixin",
+  "compatibilityLevel": "JAVA_17",
+  "refmap": "tiedup.refmap.json",
+  "mixins": [
+    "MixinServerPlayer",
+    "MixinMCAVillagerInteraction",
+    "MixinMCAVillagerLeash",
+    "MixinMCAOpenAIChatAI",
+    "MixinMCAMessenger",
+    "MixinLivingEntityBodyRot"
+  ],
+  "client": [
+    "client/MixinVillagerEntityBaseModelMCA",
+    "client/MixinVillagerEntityMCAAnimated",
+    "client/MixinMCASpeechManager",
+    "client/MixinMCAPlayerExtendedModel",
+    "client/MixinPlayerModel",
+    "client/MixinCamera",
+    "client/MixinLivingEntitySleeping"
+  ],
+  "injectors": {
+    "defaultRequire": 0
+  }
+}