implemented basic shader expressions

src/Engine/Asset/Asset.cpp

@@ -31,6 +31,13 @@ Asset::~Asset()
 {
 }
 
+void Asset::updateByteSize()
+{
+    ArchiveBuffer buffer;
+    save(buffer);
+    byteSize = buffer.size();
+}
+
 std::string Asset::getFolderPath() const
 {
     return folderPath;