wml tools GUI: added a window icon

data/tools/GUI.pyw

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+           "window_icon":PhotoImage(data=b'''
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            }
     ROOT_W,ROOT_H=800,480
     # the following string may be confusing, so here there's an explanation
@@ -1389,6 +1415,10 @@ BqseHx64ArqXErMAHiDBpQEfz9AAH9LPWT8IR9kCCT9BADs=''')
     root.title("Maintenance tools GUI")
     root.rowconfigure(0,weight=1)
     root.columnconfigure(0,weight=1)
+    # set the window icon
+    # for now, it's just a grayscale Wesnoth icon
+    # also, this line shouldn't have effect on Mac OS
+    root.tk.call("wm", "iconphoto", root, "-default", ICONS["window_icon"])
     # use a better style on X11 systems instead of the Motif-like one
     style=Style()
     if root.tk.call('tk', 'windowingsystem') == "x11" and "clam" in style.theme_names():