Use KIconDialog instead of running kdialog to choose icons
Review Request #117272 - Created April 1, 2014 and submitted
Use KIconDialog instead of running kdialog to choose icons KIconDialog is no longer in KIO, but in KIconThemes, and so we can make use of it.
Builds and tests pass. kwindowtest allows an icon to be selected when editing the toolbars, although that icon doesn't appear (probably because QIcon::fromTheme() isn't working properly for me).