add 'save to disk' symbol to the status line of the UIR editor

[Wolfgang]

this is yet another spectacular suggestion

In the CVI editor, the status line gives some useful information, e.g. that the file has been modified and needs to be saved; this is indicated by floppy disk symbol.

I miss this symbol in the status line of the UIR editor and would like to have it there, too.

Thats's it

[gdargaud]

I did that simply a long time ago by taking a screen shot of the [Save] icon, as well as [Open] and a few others, then cropped them to the right dimensions and put them in a CVI image button.