gstatusbar: constructor to add a status bar to main window
In gWidgets2: Rewrite of gWidgets API for Simplified GUI Construction

constructor to add a status bar to main window

generic for toolkit dispatch

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gstatusbar(text = "", container = NULL, ..., toolkit = guiToolkit())

.gstatusbar(toolkit, text = "", container = NULL, ...)

`text`	inital status text
`container`	A parent container. When a widget is created it can be incorporated into the widget heirarchy by passing in a parent container at construction time. (For some toolkits this is not optional, e.g. gWidgets2tcltk or gWidgets2WWW2.)
`...`	These values are passed to the `add` method of the parent container, and occasionally have been used to sneak in hidden arguments to toolkit implementations.
`toolkit`	Each widget constructor is passed in the toolkit it will use. This is typically done using the default, which will lookup the toolkit through `guiToolkit`.

## Not run: 
w <- gwindow("Statusbar", visible=FALSE)
sb <- gstatusbar("status text", container=w)
g <- gvbox(container=w)
gbutton("update", container=g, handler=function(...) svalue(sb) <- "new value")
visible(w) <- TRUE

## End(Not run)