Provide the dolphinpart view modes (Icons, Details, Columns) in konqueror's View...

Provide the dolphinpart view modes (Icons, Details, Columns) in konqueror's View Modes menu.
(this is done using a Q_PROPERTY in the dolphin part and a signal; the available view modes for creating the menu in the first place are listed in dolphinpart.desktop)
Konqueror: cleaned up the old (complex) handling of view modes as N toolbar buttons from M services grouped by library.
Dolphin: moved view mode handling to DolphinViewActionHandler, removes duplication between part and mainwindow.
BUG: 157424

svn path=/branches/KDE/4.0/kdebase/apps/; revision=774632