Make avatar buildable, and improve examples:

- Surround example code with UNITY_EDITOR condition
- Change assembly definition to depend on VRC
- Improve Example 3: Make it animate a wedge
- Improve ExampleManual Placing States: Add zero argument overload

Framework/AnimatorAsCodeFramework.asmdef

@@ -1,3 +1,18 @@
-{
-  "name": "AnimatorAsCodeFramework"
+{
+    "name": "AnimatorAsCodeFramework",
+    "references": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "VRCSDKBase.dll",
+        "VRCSDK3A.dll"
+    ],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
 }