添加link.xml，以应对unity代码裁剪

Unity/Assets/link.xml

@@ -0,0 +1,9 @@
+<linker>
+  <assembly fullname="Unity.Core" preserve="all"/>
+  <assembly fullname="Unity.Hotfix" preserve="all"/>
+  <assembly fullname="Unity.Model" preserve="all"/>
+  <assembly fullname="Unity.ModelView" preserve="all"/>
+  <assembly fullname="Unity.HotfixView" preserve="all"/>
+  <assembly fullname="Unity.Mono" preserve="all"/>
+  <assembly fullname="Unity.ThirdParty" preserve="all"/>
+</linker>

Unity/Assets/link.xml.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 4744bd8f0da5ded478607fcb7a892888
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: