Toolbar Customization Dialog

[Mihai Varga]

Hello, regarding my previous question about how to remove buttons from a
toolbar, I pulled it through with the functions
GuiView::constructToolbars() and GuiView::initToolbars() from the GuiView
files. It might not be the fastest way, but I believe i can make it
mem-leak free. Each time a user clicks on the Apply button, all toolbars
are reloaded. So what do you think about this?