Enhancement request: Support adding new items into a file

[munhon86]

Hi,

Firstly, thank you for creating this tool and provide detailed tutorial on how to use it in the wiki. Because of this, I am able to mod myself to make the game to be more interesting.

It would be great if the tool can also support adding new items into a file (thus increasing the file size). It would be something like adding weapons / armors / materias into the existing vendor's shop list for example. I think currently there is no user friendly tool / GUI that could achieve this.