Added parameter names to shader built-in function autocompletion

servers/rendering/shader_language.h

@@ -939,6 +939,7 @@ private:
 		const char *name;
 		DataType rettype;
 		const DataType args[MAX_ARGS];
+		const char *args_names[MAX_ARGS];
 		SubClassTag tag;
 		bool high_end;
 	};