replace restart checkbox with button
for one, this aligns the UX a bit more between crash dialog and report dialog (the former sports a button, not a checkbox, indeed I'm not sure why one would want this to be a checkbox). it also removes a bug where restart-on-finish would not run quick enough to finish before the application exits, since restarting is an async option because we don't know how long it really takes - instead of rearchitecturing how app exit works so it can wait for the restart, it seems more reasonable to simply have the restart action be a button and the user decide when they want to stop waiting for the restart to happen. since the button kguititem is now used in two dialogs it has moved to the globals stuff where there is a new namespace that mimics KStandardGuiItem but for our guiitems.
visualization logic has also been simplified. with the restart action now being a button with fairly generic text we can show it regardless of context so long as the app hadn't been restarted.