Adds new plc_tag_create_from_tag method available from v2.7.0 (#471)

Author: timyhac

src/libplctag.NativeImport/NativeMethods.cs

@@ -53,6 +53,8 @@ static NativeMethods()
         [DllImport(DLL_NAME, EntryPoint = nameof(plc_tag_create_ex), CallingConvention = CallingConvention.Cdecl, ExactSpelling = true, CharSet = CharSet.Ansi)]
         public static extern Int32 plc_tag_create_ex([MarshalAs(UnmanagedType.LPStr)] string lpString, callback_func_ex func, IntPtr userdata, int timeout);
 
+        [DllImport(DLL_NAME, EntryPoint = nameof(plc_tag_create_from_tag), CallingConvention = CallingConvention.Cdecl, ExactSpelling = true, CharSet = CharSet.Ansi)]
+        public static extern Int32 plc_tag_create_from_tag(Int32 src_tag_id, [MarshalAs(UnmanagedType.LPStr)] string attrib_str, callback_func_ex func, IntPtr userdata, int timeout);
 
         [DllImport(DLL_NAME, EntryPoint = nameof(plc_tag_destroy), CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
         public static extern int plc_tag_destroy(Int32 tag);

src/libplctag.NativeImport/plctag.cs

@@ -44,6 +44,11 @@ public static Int32 plc_tag_create_ex(string lpString, callback_func_ex func, In
             return NativeMethods.plc_tag_create_ex(lpString, func, userdata, timeout);
         }
 
+        public static Int32 plc_tag_create_from_tag(Int32 src_tag_id, string attrib_str, callback_func_ex func, IntPtr userdata, int timeout)
+        {
+            return plc_tag_create_from_tag(src_tag_id, attrib_str, func, userdata, timeout);
+        }
+
         public static int plc_tag_destroy(Int32 tag)
         {
             return NativeMethods.plc_tag_destroy(tag);