Added assembly definition

Author: Cibbi

Editor/ModularShaderSystemDefinition.asmdef

@@ -0,0 +1,15 @@
+{
+    "name": "VRLabs.ModularShaderSystem",
+    "references": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Editor/ModularShaderSystemDefinition.asmdef.meta

@@ -182,7 +182,7 @@ private void CopyDirectory(string oldPath, string newPath, string subpath, bool
             {
                 if (Path.GetFileName(file).Contains("EmbedLibraryWindow")) continue;
 
-                if (Path.GetExtension(file).Equals(".cs") || Path.GetExtension(file).Equals(".uxml"))
+                if (new [] {".cs", ".uxml", ".asmdef"}.Contains(Path.GetExtension(file)))
                 {
                     var lines = new List<string>(File.ReadAllLines(file));
                     var newLines = lines.Where(line => !line.Trim().StartsWith("//")).ToList();